Heat oven to 375°F. Spray 16 regular-size muffin cups with cooking spray. Separate dough into 16 triangles.
For each snack, place 1 marshmallow on shortest side of triangle. Top with 2 squares of chocolate candy. Starting with shortest side of triangle, fold corners of dough over marshmallow and chocolate, then roll to opposite point, completely covering marshmallow and chocolate; pinch dough to seal well.
Dip snacks in or brush with melted butter; roll in cracker crumbs to coat. Place in muffin cups.
Place pans on sheet of foil or cookie sheet (to catch any spills); bake 15 to 20 minutes or until golden brown. Immediately remove from muffin cups; serve warm.