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Keto s’mores bars layer buttery almond and coconut flour shortbread with pillowy homemade marshmallow and rich chocolate ganache. Bake the crust, whip the gelatin-stabilized topping without a candy thermometer, then let the layers set and chill thoroughly before slicing.
These keto s’mores bars turn the familiar chocolate-and-marshmallow combination into a sliceable dessert. Chocolate chips run through the shortbread, while the thick marshmallow topping gives each square a soft, fluffy center.
The press-in crust saves you from rolling crackers or assembling individual sandwiches. The marshmallow needs attention while mixing, but the setting time does most of the remaining work. The soft ganache makes the finish.
Leave parchment hanging over the pan’s sides so you can lift the chilled slab out without tugging on the marshmallow.
Key Ingredients & Sweetener Guide
Butter brings richness, almond and coconut flours build the crumb, and gelatin supports both layers. Egg whites provide lift, sweetener balances the chocolate, and heavy cream turns the finishing drizzle into a softer ganache.
- 4 ounces cold salted butter cut into pieces
- 1 cup almond flour
- 1/3 cup coconut flour
- 1/3 cup Joy Filled Eats Sweetener (or see alternatives in recipe notes) ()
- 2 teaspoon gelatin
- 1 teaspoon vanilla
- 2/3 cup sugar-free chocolate chips
- 4 large egg whites or ½ cup from carton
- ¼ teaspoon cream of tartar
- ¼ cup gelatin
- 1 cup water
- ½ cup powdered sweetener
- 8 oz sugar-free chocolate chips
- 2 ounces heavy cream
Cold salted butter gives the shortbread its buttery flavor and helps the dough come together in the processor. Almond flour supplies a tender crumb; absorbent coconut flour adds body. Dry gelatin helps bind the gluten-free crust and gives it a slightly chewy bite.
In the topping, egg whites hold air, cream of tartar supports the foam, and hydrated gelatin helps it set. This method skips boiling sugar syrup and watching a candy thermometer.
Because the marshmallow has no egg-cooking step, choose pasteurized egg whites to reduce concerns associated with raw eggs. Pasteurized liquid egg whites can require additional beating to develop their foam, so watch for stiff peaks rather than rushing ahead.
For sweetener alternatives, choose a granulated low-carb baking blend for the crust and a powdered version for the marshmallow. Erythritol, monk fruit, and allulose blends vary in sweetness, so follow the product’s conversion guidance rather than assuming equal-volume substitutions. Powdered sweetener helps avoid a gritty topping.
Heavy cream softens the chocolate drizzle so it cuts more readily than plain melted chocolate.
I’d keep the butter cold until the processor is ready; soft butter makes this dough harder to handle neatly.
How to Make Keto S’mores Bars Step-by-Step
This recipe makes 16 bars in an 8×8 pan. Plan around the setting and chilling stages, not just the hands-on preparation.
Shortbread Base
- Set the oven to 350°F and fit parchment into an 8×8 pan.
Keep the paper against the bottom and sides, with enough overhang to grip later. - Pulse the butter, almond flour, coconut flour, granulated sweetener, gelatin, and vanilla in a food processor, then fold in the crust’s chocolate chips by hand and press the dough evenly into the pan.
The mixture should progress from loose crumbs to cohesive clumps, with no pockets of dry flour. - Bake the crust for 16–18 minutes, checking its perimeter for color.
Look for lightly browned edges rather than a deeply browned surface.
Marshmallow Topping
- Scatter the topping gelatin across the water in a small saucepan and leave it undisturbed for 5 minutes.
The granules should absorb water and soften as they bloom. - Beat the egg whites at high speed to stiff peaks, then briefly mix in the cream of tartar.
A lifted beater should leave a peak that holds upright. - Stir the hydrated gelatin, using low heat if needed to dissolve any remaining clumps.
The liquid should flow smoothly without visible gelatin pieces. - Stir the powdered sweetener into the gelatin liquid until evenly combined.
Check for pockets of dry sweetener before pouring. - Pour the liquid into a spouted glass measuring cup, passing it through a fine-mesh strainer if gelatin pieces remain.
The pouring cup should contain a smooth mixture without rubbery bits. - Run the mixer on low and feed the gelatin liquid into the egg whites in a slow, thin stream.
Keep the addition gradual so the liquid blends into the foam. - Increase to high speed for 3–4 minutes after incorporating the gelatin, then mix in the vanilla.
The marshmallow should expand noticeably and become thick, opaque, and glossy. - Immediately spread the marshmallow across the shortbread in an even layer.
The topping should still be soft enough to smooth before it begins setting. - Allow at least an hour for the marshmallow layer to set, or refrigerate overnight.
The surface should hold its shape before receiving the chocolate drizzle.
Chocolate Drizzle
- Microwave the topping chocolate chips with the heavy cream for 15–30 seconds, stir into a smooth drizzle, distribute over the marshmallow, and refrigerate for at least 2 hours before cutting.
The finished layers should feel firm and hold together beneath the knife.
Expert Tips, Slicing & Troubleshooting
Keep the crust supported in its pan while it cools. Warm almond and coconut flour shortbread is fragile, so lifting it early can create cracks beneath the topping.
How to Cut Sticky S’mores Bars Cleanly
- Smeared layers: The bars need more chilling if the topping drags beneath the blade; wait until the slab feels firm throughout.
- Torn marshmallow: Sawing pulls the foam sideways; press a sharp knife straight down in one smooth cut.
- Sticky buildup: Residue catches the next slice; wipe the blade with a warm, damp cloth between every cut.
Preventing Lumpy or Prematurely Set Gelatin
- Rubbery specks: Undissolved gelatin causes uneven texture; gently warm the bloomed mixture over low heat and strain before adding it to the whites.
- Thick liquid in the pouring cup: Cooling gelatin becomes harder to incorporate; have the whipped whites ready before transferring the liquid.
- Uneven marshmallow surface: Delayed spreading lets the foam begin setting; keep the pan nearby and spread promptly after whipping.
Flavor Variations & Easy Shortcuts
These optional directions change the flavor or format without changing the from-scratch method above.
Cinnamon or Graham-Spiced Shortbread Crust
- Ground cinnamon adds the warm aroma associated with graham crackers.
- A brown-style low-carb sweetener brings a deeper flavor, subject to its conversion guidance.
- Graham cracker flavoring extract offers another route to that familiar campfire character.
For another chocolate-topped shortbread dessert, try keto Twix bars.
Toasted Campfire Marshmallow Finish
A lightly toasted finish can add campfire aroma. Keep any kitchen-torch browning restrained: sugar-free marshmallow may brown differently from conventional marshmallow, and scorching can leave a bitter aftertaste.
Store-Bought Sugar-Free Marshmallow Shortcut
Melt-friendly commercial keto marshmallows offer an alternative to homemade fluff. Check the package’s melting directions; products vary, and the finished layer may have a different thickness and texture.
No-Bake Keto Cereal S’mores Bars
A separate no-bake direction combines low-carb cinnamon or graham-style cereal with butter, sugar-free marshmallows, and chocolate chips. Expect a crunchy cereal bar rather than shortbread topped with fluffy marshmallow.
Storage & Make-Ahead Tips
Keep finished bars covered in an airtight container in the refrigerator. Chilling also helps preserve the structure of the marshmallow and ganache.
For make-ahead planning, use the overnight setting option in the method, then allow for the final chocolate-and-chilling stage before cutting. Keep the bars refrigerated during the extended setting period.
Separate stacked bars with parchment to prevent sticking, and transport them in a covered container kept chilled. Avoid pressing a lid directly onto the topping.
Serving Suggestions for Cookouts & Gatherings
Serve chilled for a firmer bite with a fudge-like chocolate finish. Let individual portions soften briefly before eating if you prefer a more pillowy marshmallow texture.
Smaller squares fit nicely on potluck trays and holiday dessert platters. Pair them with keto magic cookie bars for a varied bar selection. For outdoor gatherings, bring out portions as needed rather than leaving the entire container on the table.
Conclusion
Buttery chocolate-chip shortbread, fluffy marshmallow, and soft chocolate ganache give these bars their satisfying contrast of textures.
Give the layers time to set and chill thoroughly before slicing. A clean blade and a little patience make sharing much neater.
Frequently Asked Questions
What Sweetener Can I Use Instead of a Custom Sweetener Blend in Keto S’mores Bars?
Choose a granulated low-carb baking sweetener for the crust and powdered sweetener for the topping. Use the package’s sweetness conversion guidance; blends are not automatically interchangeable by volume.
Can I Use Store-Bought Keto Marshmallows Instead of Homemade Marshmallow Fluff?
Yes, melt-friendly keto marshmallows are an optional shortcut. Follow their package directions and expect a different texture from the whipped topping.
Why Does the Keto Shortbread Crust Recipe Include Gelatin?
Gelatin helps bind the almond and coconut flour dough. It adds slight chew and helps the cooled crust hold together when sliced.
Can I Use Carton Egg Whites for the Keto Marshmallow Topping?
Yes, carton egg whites are an option listed in the ingredients. Beat them until they hold stiff peaks before adding the gelatin mixture.
How Should I Store and Refrigerate Keto S’mores Bars?
Keep them covered in an airtight container in the refrigerator. Place parchment between stacked layers to protect the topping and prevent sticking.
How Do You Get Clean Slices When Cutting Sticky S’mores Bars?
Chill completely, then lift the slab using the parchment overhang. Cut straight down without sawing and wipe the knife clean between cuts.
Keto S’mores Bars
Equipment
- 8×8 pan
- Parchment paper
- Food Processor
- Small saucepan
- Electric mixer
- Spouted glass measuring cup
- Fine-mesh strainer
Ingredients
- 4 ounces cold salted butter cut into pieces
- 1 cup almond flour
- 1/3 cup coconut flour
- 1/3 cup Joy Filled Eats Sweetener (or see alternatives in recipe notes) ()
- 2 teaspoon gelatin
- 1 teaspoon vanilla
- 2/3 cup sugar-free chocolate chips
- 4 large egg whites or ½ cup from carton
- ¼ teaspoon cream of tartar
- ¼ cup gelatin
- 1 cup water
- ½ cup powdered sweetener
- 8 oz sugar-free chocolate chips
- 2 ounces heavy cream
Instructions
Shortbread Base
- Set the oven to 350°F and fit parchment into an 8×8 pan. Keep the paper against the bottom and sides, with enough overhang to grip later.
- Pulse the butter, almond flour, coconut flour, granulated sweetener, gelatin, and vanilla in a food processor, then fold in the crust’s chocolate chips by hand and press the dough evenly into the pan. The mixture should progress from loose crumbs to cohesive clumps, with no pockets of dry flour.
- Bake the crust for 16–18 minutes, checking its perimeter for color. Look for lightly browned edges rather than a deeply browned surface.
Marshmallow Topping
- Scatter the topping gelatin across the water in a small saucepan and leave it undisturbed for 5 minutes. The granules should absorb water and soften as they bloom.
- Beat the egg whites at high speed to stiff peaks, then briefly mix in the cream of tartar. A lifted beater should leave a peak that holds upright.
- Stir the hydrated gelatin, using low heat if needed to dissolve any remaining clumps. The liquid should flow smoothly without visible gelatin pieces.
- Stir the powdered sweetener into the gelatin liquid until evenly combined. Check for pockets of dry sweetener before pouring.
- Pour the liquid into a spouted glass measuring cup, passing it through a fine-mesh strainer if gelatin pieces remain. The pouring cup should contain a smooth mixture without rubbery bits.
- Run the mixer on low and feed the gelatin liquid into the egg whites in a slow, thin stream. Keep the addition gradual so the liquid blends into the foam.
- Increase to high speed for 3–4 minutes after incorporating the gelatin, then mix in the vanilla. The marshmallow should expand noticeably and become thick, opaque, and glossy.
- Immediately spread the marshmallow across the shortbread in an even layer. The topping should still be soft enough to smooth before it begins setting.
- Allow at least an hour for the marshmallow layer to set, or refrigerate overnight. The surface should hold its shape before receiving the chocolate drizzle.
Chocolate Drizzle
- Microwave the topping chocolate chips with the heavy cream for 15–30 seconds, stir into a smooth drizzle, distribute over the marshmallow, and refrigerate for at least 2 hours before cutting. The finished layers should feel firm and hold together beneath the knife.
