Heat oven to 375°F (190°C) and line or grease a baking sheet.
Unroll croissant dough, separate into triangles, and lay flat.
Put mozzarella in a bowl; cut pepperoni slices in half.
Combine melted butter, garlic powder, oregano, and basil.
Brush each triangle with the seasoned butter.
Place pepperoni on the wide end, top with 1 tbsp mozzarella.
Roll from wide end to point, keeping filling inside.
Place rolls on baking sheet; brush tops with more butter mix.
Bake 12–15 min until golden, flaky, and cheese is melted.
Cool 3 min before serving warm.