Mini Meatball and Potato Frittata (Frittata di Polpettine e Patate)

My grandmother always had something in the fridge to make a bite to eat. She could make everything delicious in a frittata. If you have leftover meatballs use those instead of making the mini meatballs in this recipe. Cooking everything in the skillet makes for easy clean up and the result makes for happy bellies.