spinach quiche recipe

Ingredients: Crust: 1 pie crust (store-bought or homemade) Filling: 1 tablespoon olive oil 1 small onion, finely chopped 2 cloves garlic, minced 5 oz (150g) fresh spinach (or 10 oz frozen spinach, thawed and drained well) 4 large eggs 1 cup (240 ml) milk (or half-and-half for a richer texture) 1 cup shredded cheese (such as Swiss, cheddar, or Gruyère)