Heat oven to 375 F. Spray a 8.5 x 12 inch casserole dish with nonstick spray.
Spread spinach over the bottom of the dish. Add garlic, cheese and green onions over the top.
In a separate bowl, beat the eggs and add seasoning salt. Pour eggs over the top of the spinach mixture. Slightly stir the eggs and spinach mixture together until combined and distributed evenly in the bottom of the dish.
Bake for 30 minutes or until the mixture is set. Let cool 5 minutes before cutting. Goes great with some Tabasco :)