Cajun Shrimp and Sausage Sheet Pan Dinner

Name: Cajun Shrimp and Sausage Sheet Pan Dinner
Ingredients: 1 pound fresh asparagus spears, washed and cut into thirds; 1 pound fresh yellow squash, cut into 1-inch pieces; 1 pound fresh zucchini, cut into 1-inch pieces; 1/2 red onion, cut into 1-inch pieces; 1 red bell pepper, cut into 1-inch pieces; 3 Tablespoons olive oil, divided use; 2 Tablespoons + 1 teaspoon low-sodium Cajun seasoning, divided; 1 pound cocktail wieners; 1 pound shrimp, veins and tails removed; Fresh parsley and fresh lemon slices for optional garnish