Looking at the top, you'll spot hazelnut frosting swirls and Ferrero Rocher pieces. Cut into our Chocolate Hazelnut Cake at Sweet Reserve Bakery in Schaumburg and you'll find moist chocolate sponge, silky hazelnut frosting and crunchy crushed Ferrero Rocher bits between the layers. Smooth white buttercream wraps the outside, tying the decoration together.