Finely chop the onion and garlic and sauté in a pot with a little butter. Add the meat and sauté until browned.
Coarsely grate the squash and chop the bell pepper, cherry tomatoes, and sun-dried tomatoes into small cubes. Add to the pot along with tomato purée, oregano, and thyme. Stir well and let simmer for a couple of minutes.
Remove the chickpeas from the pie crust and distribute your filling on the crust.
Mix eggs, milk, and salt together and pour over the beef filling.
Bake your pie for 25 minutes in the oven. About 5 minutes before it's done, spread the mozzarella on top so it has time to melt.
Serve with a green salad and enjoy