Preheat oven to 350. Spray an 8 x 8 baking dish with cooking spray.
Set aside ⅓ cup of the shredded cheese to use as a topping. Stir together the remaining ingredients. Spread in the prepared baking dish. Sprinkle with the reserved cheese.
Bake for 40-45 minutes, until the casserole is golden and bubbly.
Nutrition: The nutrition facts are for 1 serving. This recipe has 8 servings. There are 3.8 NET carbs per serving.Substitutions: You can exchange the cheddar and Monterey jack for any other kind of cheese you like. I like to have a variety of cheese instead of just one kind because it gives it more flavor. To Reheat: Place the leftovers in a casserole dish and heat in the oven at 350 degrees for 10 minutes or so until hot. You can also microwave for 1-2 minutes.