Peanut Butter Cookies!
We ended up eating these before they could be frozen, but you could easily make larger batches and freeze the cookies for later munching.
With cakes, I’ve made them, sliced them into squares or wedges, and frozen the pieces (without icing). When I need a piece of cake, I take one piece out, put it in the microwave for about 25 seconds, and then frost it with that lovely frosting that comes in the aerosol can (like whipped cream). It’s called Pillsbury Easy-Frost.