I highly recommend this if you have kids in school. The fastest, cheapest treat-- especially if they remember before bed that you have to bring snacks for the class tomorrow.
Use any leftover-stale cereal to make a nummy dessert.
1/4 cup butter
8 cups cereal (I suggest cheerios)
1- 10 oz. bag of marshmallows.
Melt the butter in large pot over medium heat. Add in marshmallows until melted. Stir in cereal until completely coated. Pour into 9x13 greased pan. With greased spoon flatten mixture in pan and let cool 1-2 hours. Cut into squares.