Chop onion, bell pepper, garlic, mushrooms, zucchini and broccoli.
Heat olive oil in a large skillet over medium to medium-high heat, sauté onions, bell peppers and garlic for 3-4 minutes, stirring often.
1 tablespoon olive oil, 1/2 cup onion, 1 cup red bell pepper, 2 cloves garlic
Add vegetable stock, pasta sauce, dry pasta and Italian seasoning; bring to a boil then lower the heat to medium-low cook stirring occasionally for 5 minutes.
2 cups vegetable broth, 2 cups marinara sauce, 1 tablespoon Italian seasoning, 3 cups rotini
Add the mushrooms, zucchini and broccoli and continue to cook, stirring every couple of minutes, until the pasta cooks to al dente and the vegetables are tender, about 6-8 minutes. Check for doneness after about 6 minutes.
1 1/2 cups zucchini, 1 1/2 cups mushrooms, 1 cup broccoli crowns