While we think that whipped cream and berries is one of summer's best combos for this cake, several other variations seem just as appealing. Use this cake as a canvas to come up with other choices.
Combine a little lemon curd or lemon zest with the whipped cream (with or without the mascarpone) for a light lemony filling on the inside.
Chocolate more your style? Fold in mini-mini chocolate chips to the filling (with or without the mascarpone) or add finely chopped chocolate to the mixture.
Or think crumbs, as in Oreo crumbs, if you're a fan of the Blizzard-style summer treat. Fold those into the whipping cream filling instead, in a variation of the Nabisco chocolate wafer/whipped cream dessert.
Or make this a cake with more than two layers by baking it in round pans and slicing each into two layers (for a total of four). If you have a cake carrier, this is a particularly handy way of storing the cake in the refrigerator and carrying it elsewhere, as needed.