INGREDIENTS
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1 large spaghetti squash (, about 3 1/2 pounds (See Notes))
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3 teaspoons olive oil (, divided use)
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1 medium onion (, chopped)
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3 cloves garlic (, finely chopped)
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1 can ((28 ounces) crushed tomatoes)
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2 teaspoons dried Italian seasoning
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1/4 teaspoon red pepper flakes
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1 1/2 teaspoons salt (, divided)
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1/2 teaspoon pepper (, divided)
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1 container ((15 ounces) part skim ricotta cheese)
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1 large egg
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5 ounces baby spinach (, steamed and chopped (can use frozen spinach))
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1/3 cup grated Parmigiano-Reggiano cheese
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Chopped parsley for garnish ((optional))