For an extra layer of flavor, consider adding a squeeze of fresh lemon juice to the vegetables before roasting. Adjust the amount of Cajun seasoning to your preference. If you like it spicy, add a pinch of cayenne pepper. Feel free to substitute other vegetables based on your preference and what's in season. Bell peppers, mushrooms, or broccoli would all be great additions. Make sure not to overcook the shrimp. They should be just opaque and slightly firm to the touch. Overcooked shrimp can become rubbery. For easy cleanup, line your sheet pan with parchment paper or foil.