Boil pasta according to directions in heavily salted water until al dente.
Meanwhile, sauté mushrooms, zucchini, and garlic in 2 tablespoons olive oil and salt and pepper to taste in a large skillet. After stirring initially, allow to sit undisturbed to allow the water from the vegetables to evaporate so the vegetables brown. (approximately 5 minutes)
Add marinara sauce to vegetables, stir, and allow to heat up.
Drain pasta and add to sauce and stir.
Serve with parmesan cheese and extra pepper.
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