2 red peppers, cored and cut into 1-inch wide strips
2 zucchini, quartered lengthwise and cut into 1-inch cubes
2 summer squash, quartered lengthwise and cut into 1-inch cubes
4 cremini mushrooms, halved
1 yellow onion, peeled and sliced into 1-inch strips
1/4 cup extra-virgin olive oil
1 teaspoon salt, divided
1 teaspoon freshly ground black pepper, divided
1 tablespoon dried Italian herb mix or herbs de Provence
1 pound penne pasta
3 cups marinara sauce (store bought or homemade)
1 cup grated fontina cheese
1/2 cup grated smoked mozzarella
1 1/2 cups frozen peas, thawed
1/4 cup grated Parmesan, plus 1/3 cup for topping
2 tablespoons butter, cut into small pieces