I hope this helps....I haven't tried this out.

Peanut Butter Bars

12 Eggs
6 c Sugar
3 c brown sugar
2 c peanut butter
1 c shortening
2 Tbsp. vanilla extract
8 c flour
3 Tbsp. baking powder
2 tsp. Salt

Cream the eggs, sugars, peanut butter, shortening, and vanilla until smooth. Combine flour, baking powder, and salt; gradually add to creamed mixture and mix well. Spread into 3 greased 15"x10"x1" baking pans. Bake at 350 deg. for 20-25 minutes or until top is golden brown. Cool.

PEANUT BUTTER FROSTING:
In saucepan over low heat, melt 1/2 cup each peanut butter and light corn syrup. Stir in 2 cups powdered sugar, 1 tablespoon milk, and 1 teaspoon vanilla; mix until smooth. Makes 1 1/2 cups.