1 pkg. yellow cake mix
2 1/2 c. creamy peanut butter
3/4 c. chocolate syrup
8 oz. semisweet chocolate
1 c. powdered sugar
1/4 c. milk
Chopped peanuts

Preheat oven to 350 degrees. Grease and flour 2 (9 inch) cake pans. Prepare cake according to package directions, beating in 1/2 cup peanut butter. Divide between prepared pans. Bake until toothpick inserted comes out clean, about 20 minutes. Combine chocolate syrup and semisweet chocolate in heavy small saucepan. Stir constantly over low heat until chocolate is melted and mixture is smooth. Transfer chocolate mixture to large bowl. Stir in remaining 2 cups peanut butter, then powdered sugar, then milk. Continue stirring until smooth. Ice layers and outside of cake. Garnish peanuts on sides.