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Heat 2 tsp olive oil in a large pan over medium heat. Add the onions, saute for 5 minutes. Add the garlic and cook for 30 seconds.
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Add the bell peppers, zucchini, squash, baby spinach, Italian seasoning, oregano, salt, pepper, and crushed red pepper, saute for 10 minutes or until the veggies are tender, but crisp.
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While the veggies are cooking, cook the pasta according to package directions.
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Preheat the marinara sauce.
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Serve the pasta with the sauce, veggies, and top with parmesan cheese.