1/2 c. butter
1 (10 oz.) pkg. marshmallows OR 40 large marshmallows
5 c. Rice Krispies
1/2 c. peanuts (optional)

In a large saucepan, melt butter on low heat. Add marshmallows and stir until melted. Remove from heat. Add cereal and peanuts if desired. Stir until well-coated in marshmallow mixture. Press mixture into a greased 9 x 13 inch pan. Cool and cut.