Sprinkle with extra graham crumbs and add chocolate pieces while warm. Serve immediately.
Prep dough: Unroll crescent dough and press seams together into one sheet.
Spread filling: Spread graham mixture evenly over dough, leaving a 1-inch border.
Add mix-ins: Sprinkle chocolate chips and mini marshmallows evenly over the surface.
Roll log: Roll tightly from the long side into a log and pinch seam to seal. Chill 10 minutes for cleaner slicing.
Slice rolls: Cut into about 12 equal slices and place in a greased baking pan (slightly touching).
Bake: Bake at 375°F (190°C) for 12–15 minutes until golden and baked through.
Toast tops: Add 1 large marshmallow to each roll and toast briefly under the broiler (watch nonstop) until lightly golden.
Finish: Sprinkle with extra graham crumbs and add chocolate pieces while warm. Serve immediately.