Preheat the oven to 375 degrees. Spray a muffin tin with nonstick spray.
Dust your work surface with flour, and unroll the tube of crescent roll dough, pinching seams back together. Cut into eight equal squares.
Dip a marshmallow in butter and then cinnamon sugar, and then wrap in dough. Pinch seams together and place seam side down in the muffin tin well. Repeat with remaining marshmallows.
Bake for 9-11 minutes. Allow them to cool for 5 minutes before removing from the tin.