Note; you may use anywhere from 1/2 cup to 3/4 cup of olive oil. It will not be oily! The tomatoes will release a good amount of liquids and this will create a tasty sauce. Generally gluten-free pastas tend to be a bit dry, so the extra oil will come in handy. You can always soak up any remaining oil with a good crusty bread. Optional to add a 1/2 cup of pasta water to the casserole if you need more liquids.