1. Preheat the oven to 350 degrees F. In a large bowl, beat all the base ingredients except the marshmallows with an electric mixer on low speed until crumbly. Press the mixture firmly in the bottom of an ungreased 9x13-inch pan.
2. Bake for 12 to 15 minutes or until light golden brown. Immediately sprinkle marshmallows over the base. Base 1 to 2 minutes longer or until marshmallows just begin to puff. Cool while preparing topping.
3. In a 3-quart saucepan, mix all topping ingredients except cereal and peanuts. Heat over low heat, stirring constantly, just until the chips are melted and mixture is smooth. Remove from heat. Stir in the cereal and peanuts. Immediately spoon the warm topping over marshmallows; spread to cover. Refrigerate until firm, about 45 minutes. Cut into 36 bars. Store in an airtight container at room temperature.