1 pkg. Pillsbury plus devils food cake mix
1/2 c. firmly packed brown sugar
1/3 c. peanut butter
1/4 c. butter, softened
1/3 c. milk
1 egg
2 c. miniature marshmallows

Heat oven to 325°F. Grease bottom of 13 x 9 pan. In large bowl combine cake mix, brown sugar, peanut butter and butter at low speed till crumbly. Add milk and egg, stir until blended. Spread in prepared pan.

Bake at 325°F for 25 - 30 minutes or until bars are set. Remove from oven and immediately sprinkle with marshmallows. Return to oven 1 - 2 minutes or until marshmallows begin to puff. Cool while preparing frosting.

Frosting:

1/2 c. sugar
1/4 c. milk
2 tbsp. butter
1/2 c. semi-sweet chocolate morsel chips
1 tsp. vanilla

In small saucepan, combine sugar, milk and butter, bring to a boil stirring constantly, boil 1 minute. Remove from heat. Stir in chocolate chips and vanilla until smooth. Drizzle evenly over marshmallow. Cool completely. Cut into bars.