Mars Bar Rice Krispies Squares

4 regular size Mars bars
1/2 cup butter
2 cups Rice Krispies
1 cup milk chocolate chips

Melt butter and Mars bars over medium-low heat in large saucepan until smooth. Remove from heat. Stir in Rice Krispies. Press into greased 8-inch square pan. Top with chocolate chips and place under broiler for 30 seconds. Remove from oven and spread chocolate evenly over square. Put in refrigerator to set chocolate, 30 minutes to 1 hour.

Cut into squares and serve.