Payday Bar Cake

1 (18.25 ounce) box yellow cake mix
1/3 cup butter
3 cups miniature marshmallows
2/3 cup light corn syrup
1 egg
2 teaspoons vanilla extract
2 cups peanut butter chips
2 cups salted peanuts
1 1/2 cups puffed rice cereal
1/4 cup butter

Heat oven to 350 degrees F.

Mix together the cake mix, 1/3 cup butter or margarine and the egg. Press into the bottom of a 13 x 9-inch pan and bake at 350 degrees F for 12 to 18 minutes. Remove from oven and sprinkle with miniature marshmallows. Return to oven for 1 to 2 minutes or until the marshmallows begin to puff.

In a saucepan over medium heat cook corn syrup, 1/4 cup butter of margarine, vanilla extract and peanut butter chips until melted. Remove from heat and stir in the puffed rice cereal and salted peanuts. Spoon mixture over top of marshmallow topped cake and spread to cover. Allow to cool before serving.