Wash your hands well with soap and warm water for at least 20 seconds.
Drain spinach.
Drain diced tomatoes.
Bring water to a boil in a small pot. Slowly add grits and stir. Turn heat to low and follow package directions, stirring occasionally until thick. Add butter and stir.
Coat 9 x 13 baking dish with vegetable oil cooking spray. Add grits, spinach, diced tomatoes, and cheddar cheese and stir to combine ingredients.
Beat eggs and pour over ingredients in baking dish. Season with garlic powder, pepper, and hot sauce (optional). Stir and spread in an even layer in baking dish. Place in oven and cook for 35 minutes.