Preheat your oven to 350°F (175°C).
Scoop the flesh out of the baked sweet potato, discarding the skin. In a large mixing bowl, thoroughly mash the sweet potato.
Add the ground turkey, egg, 1/4 cup of the ketchup, dried onion flakes, marjoram, and kosher salt to the bowl. Using a fork, blend the ingredients well, ensuring the turkey mixture is uniformly combined.
In a separate small bowl, mix the remaining 2 tablespoons of ketchup with the Worcestershire sauce to create a tangy glaze.
Shape the turkey mixture into a loaf and transfer it onto a baking sheet. Spread the ketchup-Worcestershire glaze evenly over the top.
Place the loaf in the preheated oven and bake uncovered for 55 minutes. Once done, allow the meatloaf to rest for about 5 minutes before slicing and serving.
If you don’t have a pre-baked sweet potato, you can cook it quickly in the microwave or opt for baking in an oven or air fryer for a softer texture.