Preheat oven to 400 degrees and lightly grease or line a baking sheet with parchment or a nonstick baking mat.
Unroll the crescent dough and gently separate the triangles. (I like to use a pizza cutter to get nice even lines)
Stir together pecans, brown sugar, flour, cinnamon, and melted butter.
Add a scoop (about 2-3 tablespoons) to each of the triangles, at the wide end. (I always error on the side of too much filling, I like it to spill out the ends a bit.)
Gently roll up each crescent starting with the wide end of the triangle and rolling toward the skinny pointed end. Place on prepared baking sheet 2-3 inches apart.
Bake in preheated oven for about 8-10 minutes until golden brown.
While roll ups are baking, heat caramel sauce a bit in the microwave or on the stovetop.
Drizzle caramel sauce over roll ups. Top with a sprinkle of cinnamon-sugar if desired. Serve warm.