Preheat oven to 325. Mix box of cake mix, pudding mix, eggs, oil & milk (DO NOT follow directions on cake mix box!). Pour into greased 9in round cake pan. Bake till toothpick inserted into middle comes out clean.
Cut cake into 2 layers. Add icing to bottom layer. Place top layer on & finish icing the whole cake. WITHOUT SEPARATING THEM, place each box of Peeps around edges of cake. 1 by 1, add chocolate chips to the rest of the top of the cake.