Do you have some leftover Halloween candy? Try these.. Here's how to do it straight from Confessions of a Cookbook Queen Bake a pan of brownies according to your recipe/box but when they’re done, remove from oven and DON’T turn the oven off. Immediately sprinkle the surface generously with mini marshmallows (for a 9×13 pan you’ll probably need 3-4 cups) and about a cup of assorted candy. I used Fall colored M&Ms and Candy Corn, but you really could use anything. For Christmas you could find some red, white and green candy that would look really cute and festive too.