Step 1: Preheat and Prepare

Position an oven rack in the center of the oven and preheat to 400°F (200°C). For the easiest cleanup, line a large, rimmed baking sheet with parchment paper. Pro tip: Placing the sheet pan in the oven while it preheats will help the vegetables start searing immediately for better browning.

Step 2: Season the Hearty Vegetables

In a large mixing bowl, combine the halved/quartered potatoes and the red onion wedges. Drizzle with about 2 tablespoons of the olive oil. In a small bowl, whisk together the dried oregano, dried basil, smoked paprika, red pepper flakes (if using), salt, and black pepper. Sprinkle half of this seasoning mixture over the potatoes and onions. Toss well to ensure everything is evenly coated.

Step 3: First Roast

Carefully remove the hot sheet pan from the oven. Spread the seasoned potatoes and onions in a single, even layer. It’s important not to overcrowd the pan, as this will cause the vegetables to steam instead of roast. If necessary, use two sheet pans. Place the pan in the preheated oven and roast for 20 minutes. This gives the denser, longer-cooking vegetables a head start.

Step 4: Add the Remaining Ingredients

While the potatoes and onions are roasting, add the broccoli florets, red bell pepper chunks, smashed garlic cloves, and sliced vegetarian sausages to the same large mixing bowl (no need to wash it). Drizzle with the remaining 2 tablespoons of olive oil and sprinkle with the remaining half of the seasoning mixture. Toss everything thoroughly to coat.

Step 5: Second Roast

After 20 minutes, carefully remove the sheet pan from the oven. The potatoes should be starting to soften. Add the seasoned broccoli, bell peppers, garlic, and sausage to the pan, nestling them amongst the potatoes and onions. Spread everything back out into an even layer.

Step 6: Finish Roasting

Return the pan to the oven and roast for another 15-20 minutes. The vegetables should be tender and caramelized at the edges, and the vegetarian sausage should be browned and heated through. For extra color and crispiness, you can switch the oven to the broil setting for the last 2-3 minutes, watching it very carefully to prevent burning.

Step 7: Serve

Remove the sheet pan from the oven. If desired, squeeze a little fresh lemon juice over everything to brighten the flavors, and garnish with fresh chopped parsley and a sprinkle of Parmesan or vegan Parmesan cheese. Serve immediately, directly from the pan or transferred to a platter