Paella Frittata: Turn your leftover paella into a tasty frittata by whisking together some eggs and pouring them over the paella in a frying pan. Bake in the oven until the eggs are set, then slice and serve. Paella Stuffed Peppers: Cut the tops off some peppers and remove the seeds and membranes. Stuff the peppers with the leftover paella and bake in the oven until the peppers are tender and the filling is heated through. Paella Croquettes: Mix the leftover rice with a beaten egg to bind, form into small balls or cylinders, coat in breadcrumbs, and then fry until golden. Serve with aioli or a spicy tomato sauce for dipping.