Meatball Frittata with Mozzarella and Tomatoes

There may be no better way to stretch odds and ends around the kitchen than to make a frittata: there’s no crust to fuss with, the eggy matrix can handle almost any savory inclusions, and the frittata itself can be enjoyed hot or at room temperature. We have a regular movie night with our friends, and I often serve meatballs, since grown-ups and kids like them with equal verve. I always make extra meatballs, in part because they taste even better the next day. Last time we slurped spaghetti and watched some Hitchcock, I got thinking about a meatball- studded frittata. The next day I whipped up my vision and loved how the pockets of mozzarella puffed and bubbled dramatically.