Ingredient substitutions: Swap out the vegetables for whatever is in season or on hand; broccoli and asparagus make great alternatives. For protein, consider shrimp or seitan for a different taste. Optional variations: Add a sprinkle of cheese on top during the last 5 minutes of baking for an extra layer of flavor. Storage or reheating tips: Store leftovers in an airtight container in the fridge for up to three days. Reheat in the microwave or re-roast in the oven until warmed through.