Go to the Recipe: Chocolate peanut butter fudge cake
It sounds like a good idea, but there is no recipe, I am unable to form a good opinion one way or another. The forum might be the best place for this. The link provided takes one to a food grade plastics provider, not a specific product. While the company looks like a fine provider, I don't see anything that stands out from any other plastics provider. Is there a specific product they're selling that you had in mind? This also might be a better post for the forum rather than the community recipe gallery.
Ingredients
2 cups all-purpose flour
2 cups sugar
1 teaspoon baking soda
1 cup butter or margarine
1/4 cup cocoa
1 cup water
1/2 cup buttermilk
2 large eggs, lightly beaten
1 teaspoon vanilla extract
1 1/2 cups creamy peanut butter
Preparation
Combine first 3 ingredients in a large mixing bowl; set aside.
Melt butter in a heavy saucepan; stir in cocoa. Add water, buttermilk, and eggs, stirring well.
Cook over medium heat, stirring constantly, until mixture boils. Remove from heat; add to flour mixture, stirring until smooth. Stir in vanilla. Pour batter into a greased and floured 13- x 9-inch baking pan.
Bake at 350° for 20 to 25 minutes or until a wooden pick inserted in center comes out clean. Cool 10 minutes on a wire rack. Carefully spread peanut butter over warm cake. Cool completely.
Spread Chocolate Frosting over peanut butter; cut into squares.
This is what you want to have posted up above. It seems like a decent recipe. I still have no opinion on the packaging because you really haven't specified what you plan to use, but the recipe seems ok.
