In a large, deep dutch oven add the uncooked pasta, onion, mushrooms, broccoli, broth, garlic, crushed red pepper, dried herbs, salt and pepper.
16 ounces spaghetti, 1 small onion, 4 cloves garlic, 4 1/2 cups chicken or vegetable broth, 2 cups broccoli florets, 2 cups white button mushrooms, 2 teaspoons sea salt, 2 teaspoons crushed red pepper, 2 teaspoons dried Italian herbs, 1 teaspoon freshly ground black pepper