In a large bowl, add spinach mixture, ricotta cheese, eggs, cornstarch, pimentos, 1 cup of shredded mozzarella cheese, monterey jack cheese, and mustard.
Stir well to combine and pour into a pie plate.
Bake for 20 minutes and then top with the remaining cup of mozzarella cheese.
Bake for another 20 minutes, until the top is golden brown.