This cake is much easier than it looks. You can take any flavor cake mix and combine it with any frosting of your choice, add an interesting filling and top it with your favorite candy pieces. This one is obviously, snickers candy bars. I use the small snack sized squares and cut them in half. I prefer dark chocolate fudge cake mix. Take two boxes, mix according to the directions on the box. Bake two of them in two 9 x 2 round pan. Cool completely before adding frosting or filling. I make the filling for this cake. 1/2 a 12 oz jar of Peanutbutter (crunchy or smooth, your preference) and 1 can of buttercream frosting. Mix with mixer and spread over bottom layer, using all, it will be thick. Place top layer on the filling and frost with two cans of Milk chocolate frosting. I decorate the top with the snickers, cut in half and then drizzle carmel and hot fudge topping over it all. (this is just ice cream topping). In this picture there are white puffs on the top, those are a white fluffy frosting (Betty Crockers fluffy frosting mix) but not necessary unless you want to add this.
Like I said, you can do this with just about any candy. I made one for a friend, who loves almond joy. The filling was vanilla frosting, a couple of drops of coconut flavoring, mixed thoroughly with a mixer, and of course, half a bag of shredded coconut. I topped it with almond joy candy bars and chocolate covered almonds. a sprinkling of coconut on the sides made it look delectable!