Easy Spinach Meatball Bake Ingredients 4 cups penne (cooked according to package directions) 1 1/2 cups pasta water 2 tsp olive oil 1 sweet onion, diced 4 cups lightly packed baby spinach 1 1/2 cups tomato sauce 1/2 cup light ricotta cheese 1 tsp garlic powder 1 tsp Italian seasoning 1/2 tsp Pink Himalayan salt