1/4 pound shiitake or cremini mushrooms, roughly chopped
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1 medium onion, chopped, about 1 1/2 cups
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2 cloves garlic, minced
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1/4 teaspoon red pepper flakes
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3 cups or 24 ounces of marinara or meatless tomato sauce*
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1 1/2 cups water
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1 Tbsp Italian seasoning
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1/4 cup chopped fresh parsley
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1 Tbsp olive oil plus more for greasing the casserole dish
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1 cup grated Parmesan cheese
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2 eggs, beaten
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1 cup ricotta cheese
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2-3 cups shredded mozzarella cheese
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*You can make your own or use a good quality jarred sauce. To make your own, make a double recipe of our basic tomato sauce, blend it smooth to use in this baked spaghetti recipe.