Preheat the oven to 400°F. Lightly oil a large sheet tray.
In a bowl, mix turkey, onion, sweet potato, 3 tablespoons barbeque sauce, 1 teaspoon salt and ¼ teaspoon pepper.
Form into four loaves, brush with remaining 1 tablespoon barbecue sauce and bake on sheet tray for 20 minutes.
In a large bowl, toss green beans with maple syrup, oil and remaining ½ teaspoon salt and ¼ teaspoon pepper.
Arrange on sheet tray next to meatloaves and roast until tender and meatloaves are cooked through (165°F), 20 to 25 minutes more.
