Preheat oven to 350°F (180°C). Spray a 9-inch pie plate with cooking spray and set aside.
Place oil, eggs, baking mix, Parmesan, Cheddar, and onion in a large mixing bowl and stir to combine. Gently fold in tomatoes. Pour into prepared dish.
Bake for 40-45 minutes, or until cooked through and golden brown.
Notes
*I like THIS organic all-purpose pancake/waffle mix that’s made by The Immaculate Baking Company. You can also make your own all-purpose mix by using a recipe like this one.
Variations For Making This Tomato Pie
Use any type of fresh tomatoes for this pie
Try adding green onions (spring onions) or chives for a stronger onion flavor
Add spices and herbs such as red pepper flakes or oregano
Mozzarella or any good melting cheese such as gruyere would also work great