Cream Puff Gateau
This impressive layered dessert is made of pâte a choux, the same dough used to make éclairs.
Choux pastry is just butter, water, flour, sugar, and eggs. There isn't even any tricky whisking. If you can make brownies from a box, you can do this.
Once you stir everything together, you're golden. Bake the rounds, whip the cream, and stack with layers of jam for an impressive dessert in about an hour.
Recipe: Cream Puff Gateau