Line a 13x18 inch baking sheet with parchment paper (optional). Set aside.
Wash and dry the veggies. Slice the bell pepper in half and remove the seeds and membrane. Julienne the pepper into 1/2 inch thick slices. Cut the zucchini into 1/4-1/2 inch pieces. Slice the onion into half rings, about 1/2 inch thick.
Place the veggies and shrimp on the baking sheet.
Season the veggies and shrimp with garlic parsley salt and oil, tossing until evenly coated. Arrange the mixture into a single layer on the baking sheet.
Broil at 450°F (or on medium setting) for about 8-10 minutes, or until the shrimp is cooked through and the veggies are tender. Enjoy!