Here's what you'll need:
1 - 12.8 box of Rice Chex Cereal
1 - 10 ounce bag of miniature marshmallows
4 tablespoons of butter
In a large microwave safe bowl melt the butter. When melted add the marshmallows and stir to coat. Put bowl back in the microwave for about 2 minutes and melt the marshmallows. Take the bowl out and stir mixture until smooth. Add in the Chex cereal and stir to coat. Pour mixture into a greased 9x13 pan. Let stand until set. Cut into squares and devour!