Heat Oven to 400 degrees Fahrenheit
Take your mushrooms and remove stems and wash all excess dirt and grime from them.
Next on a cookie tray or cooking stone brush both sides of mushrooms with olive oil
Put into oven and bake for 5 minutes only
Once you have baked the mushrooms for 5 minutes add on the sauce, the minced garlic, chopped onion and bell pepper, sliced cherry tomatoes, spinach and season the top with the salt and Italian seasoning.
Place however much mozzarella cheese you want or leave it as is to make dairy free.
Place back into oven and cook ten minutes or until cheese is lightly browned.
Let sit for 10 minutes and serve warm.