Preheat oven to 375°F (190°C) and line a baking sheet with parchment paper.
Unroll the crescent dough and separate into 8 triangles.
Place 3 pepperoni slices and a generous sprinkle of mozzarella cheese on each triangle.
Roll up each triangle from the wide end to the tip to form rolls.
Place rolls on the prepared baking sheet, seam-side down.
Mix melted butter with garlic powder and Italian seasoning, then brush over the tops of the rolls.
Bake for 10-12 minutes or until golden brown.
Serve warm with marinara sauce for dipping.