BASE:

1 pkg. yellow cake mix
1/3 c. butter, softened
1 egg
3 c. miniature marshmallows

TOPPING:

2/3 c. corn syrup
1/4 c. butter
2 tsp. vanilla
1 pkg. peanut butter chips
2 c. crisp rice cereal
2 c. salted peanuts

Heat oven to 350 degrees. In large bowl, combine cake mix, 1/3 cup butter, softened, and egg at low speed until crumbly. Press in bottom of ungreased 13 x 9 inch pan. Bake at 350 degrees for 12 to 18 minutes, or until light golden brown. Remove from oven and immediately sprinkle with marshmallows. Return to oven for 1 to 2 minutes, or until marshmallows just begin to puff. Cool while preparing topping.

TOPPING: In large pan, heat corn syrup, butter, vanilla, and chips, just until chips are melted and mixture is smooth, stirring constantly. Remove from heat, stir in cereal and nuts. Immediately spoon warm topping over marshmallows. Spread to cover. Chill and serve.