This quiche is so delicious and easy to make in addition to being budget friendly. We never have leftovers, even with several picky eaters in the house!
Preheat oven to 400 degrees F (200 degrees C).
Line two 9-inch pie plates with crusts. Cover crusts with a double layer of aluminum foil and a layer of pie weights or dried beans.
Bake in the preheated oven until edge of crust is golden, about 10 minutes. Carefully remove the foil and weights; continue baking until the crust sets, about 5 minutes more. Let crusts cool briefly. Reduce oven temperature to 350 degrees F (175 degrees C).
Sprinkle cheese, spinach, and onion evenly onto the crusts. Whisk eggs, milk, salt, and pepper together and divide evenly between the crusts.
Bake in the center of the preheated oven until golden brown and firm in the centers, about 45 minutes.
Per Serving: 310 calories; protein 14.6g; carbohydrates 15g; fat 21.5g; cholesterol 154.9mg; sodium 386.5mg.