Preheat oven to 400 ° F and spray a sheet pan with nonstick cooking spray (I used avocado oil cooking spray).
Cut the Brussels sprouts in half and cut the sweet potatoes in cubes about the size of the Brussels sprout halves. Spread these evenly on the sheet pan.
Drizzle the veggies with avocado oil and season with salt and pepper.
Drizzle 2 tbsp of maple syrup over the sweet potatoes.
Dice the onion and green bell pepper. Set aside.
In a medium-sized bowl, mix the ground beef, bread crumbs, egg, coconut aminos, garlic powder, salt, pepper, and ½ cup of BBQ sauce.
Create 6 divots in the vegetables on the sheet pan for the meat loaves to sit.
Form the meat mixture into 6 oval shaped loaves and place in the divots you created on the sheet pan.
Make the sauce by mixing ½ cup BBQ sauce with 2 Tbsp. maple syrup and brush half of the sauce along the tops of the meatloaves, reserving the other half of the sauce for topping the meat loaves after they come out of the oven.
Place sheet pan in oven and cook for 15 minutes, removing sheet pan to stir vegetables.
Place sheet pan back in oven and cook for 10-15 more minutes until a meat thermometer reaches 165 °.