Sheet Pan Sausage and Veggies - The Girl Who Ate Everything

Name: Sheet Pan Sausage and Veggies - The Girl Who Ate Everything
Cuisine: American
Ingredients: 2 cups broccoli florets; 2 cups bell peppers, cut into 1-inch strips, (red, yellow, or orange peppers); 2 cups zucchini, sliced in half rounds; 1 red onion, sliced into strips; 1/4 cup olive oil; 1 Tablespoon Dijon mustard; 1 teaspoon garlic powder; 1 teaspoon onion powder; 1 teaspoon paprika; salt and pepper to taste , (I use 1 teaspoon kosher salt and 1/4 teaspoon pepper); (optional) freshly grated Parmesan cheese to top; (optional) chopped parsley for garnish; 2 impossible italian sausage links