Preheat oven to 400 degrees. In a medium skillet add in 3 tbsp. olive oil, 1/2 yellow onion & 3 cloves garlic minced. Let it sauté for 2 minutes on medium heat.
Sprinkle the salt, basil, garlic powder, onion powder, pepper & cayenne on top. Sauté for 2 minutes. Then with spatula fold in your chopped fresh spinach for 1 minute.
In large 9 X 13 baking dish, spray with olive oil. Then pour 2 cups of your sauce of choice at the bottom of your dish, spread out evenly with the back of your measuring cup.