In a large bowl, combine ground turkey, onion, egg, ketchup, bread crumbs, parsley, Italian seasoning, salt, and pepper. Mix until just combined (I use my hands). Do not overmix.
1 pound ground turkey , 1 small onion, grated or finely minced, 1 large egg, beaten, ½ cup ketchup, additional for topping if desired, ½ cup bread crumbs, ½ cup minced fresh parsley, 1 teaspoon Italian seasoning, ½ teaspoon coarse ground black pepper, ½ teaspoon kosher salt
Divide meat mixture into 4 evenly sized mini meatloaves and place on a rimmed sheet pan, 13 x 18 inches.
Toss the potatoes and carrots with olive oil, salt, and pepper in a clean bowl. Arrange potatoes and carrots around meatloaves in an even, single layer.
1 pound small potatoes, cut in half, 1 pound carrots, cut into ½ -inch rounds , 2 tablespoons olive oil, ½ teaspoon kosher salt, or to taste, ¼ teaspoon coarse ground black pepper, or to taste
Bake for 20 minutes. Remove pan from oven, carefully stir potatoes and vegetables, and return pan to oven.
Continue to bake for 10 to 15 minutes or until internal temperature of meatloaves registers as 165°F on an instant read thermometer, and potatoes and carrots are tender. If desired, top meatloaves with additional ketchup in the last 2 to 3 minutes of cooking time.
Let cool for 5 minutes before serving.
Notes
Meat: Any type of ground meat or a combination can be used. Choose meat with a lower fat percentage so the sheet pan meal doesn't get too greasy.
Different vegetables: Feel free to substitute vegetables you prefer or have in the fridge. Shorter-cooking vegetables can be added halfway through the total cooking time.
Variations: To make Whole30 compliant, use almond meal/flour instead of breadcrumbs, or skip the breadcrumbs completely. Use a Whole30 compliant ketchup. To make gluten-free, use oats or oat flour instead of breadcrumbs.