Combine all of the bar ingredients except the marshmallows in large mixing bowl; mix until crumbly. Press the mixture firmly into the bottom of 13×9 2-inch baking pan
Bake in a 350 degree oven for 12-15 minutes or until golden brown. Remove from the oven and immediately sprinkle 3 cups mini-marshmallows over the surface
Return to oven just until the marshmallows begin to puff (1-2 min)
Remove from the oven; cool while preparing the topping
Topping
In a large saucepan, stir together the first 4 topping ingredients, cook over low heat stirring constantly, until the chips are melted and mixture is smooth
Remove from the heat; stir in the rice cereal and peanuts
Immediately spread the mixture over the marshmallows
Cover and refrigerate until firm (2 hrs) Cut into bars and enjoy!