Peanut butter crunch chocolate cake

I got this idea from my Relief Society president...I made it for the girls and hope they will like it tonight!

Make a regular devil's food cake mix and bake in two 9" pans.  Put one cake on the bottom and spread a thick layer of Jif peanut butter on the bottom layer and then add about 1/2 cup of crushed Ruffles potato chips on top of the peanut butter.  ( I put the chips in my food processor on crush for just a couple pulses, but you really could do it with your hands.)  Then take the top layer of the cake and put a very thin layer of your favorite chocolate buttercream frosting on the bottom of the cake.  Next put that top layer on the bottom and spread the rest of the chocolate frosting on the top and sides of the cake.  Here is how I made my chocolate buttercream frosting today:  1/2 cup of room temp butter, One packet of choco bake, 1/4 cup of regular cocoa powder, 1/8 cup of milk, 2 tsp. vanilla, powdered sugar until it is a frosting consistency.