Heat the oven to 400 °F. Begin once the oven is fully hot so the cheese melts evenly instead of drying out slowly.

Cover a cookie sheet with a baking mat or parchment paper. The lined surface lets the melted mozzarella release cleanly without tearing.

Arrange the mozzarella slices on the lined sheet and bake for 6 minutes. Take the pan out when the centers bubble and the edges show slight browning.

Let the cheese sit briefly, then scatter on Italian seasoning and add pepperoni if desired. The surface should feel warm and pliable with gentle resistance rather than runny or stiff.

Lift an edge with a thin spatula and roll each slice into a snug cylinder, leaving the seam underneath. As the cheese cools, the seam settles against the plate and helps the roll hold its shape.