Use refrigerated sugar cookie dough. Roll out the dough, place your chocolate on the dough and marshmallows then place another piece of dough over the top and "crimp" the edges. Add a sucker stick if you want. Bake using cookie dough instructions.
If you're the type of person who hates to throw anything away, then turn your unwanted items into gorgeous DIY projects. After all, one person's trash is another's treasure, right? Get inspired by these DIY ideas for ordinary household objects.