Preheat the oven to 400F and line a half sheet pan with parchment paper.
Wash and dry the broccoli and cauliflower and cut into florets. Remember, the veggies should be cut in a consistent manner, meaning each floret is about the same size to ensure even roasting.
Place the broccoli and cauliflower on the prepared sheet pan. Pour the olive oil over the veggies and sprinkle with salt and pepper. Toss to combine the veggies with the oil and seasonings.
Roast the veggies in the oven for 10 minutes.
While the veggies roast in the oven, combine all meatloaf ingredients in a large bowl. Form into 4 equal “loaves,” approximately 1.5” tall.
Remove the sheet pan from the oven. Push the veggies to the perimeter of the sheet pan, leaving room in the center for the meatloaves.
Return the sheet pan to the oven for 20-25 minutes, or until a thermometer reads 160-165F. Optional: Sprinkle extra parmesan (a few tablespoons) onto the vegetables for the last 5 minutes of cooking. I highly recommend this step--it adds great flavor!