Preheat the oven to 350°F. Line the bottom of a smaller broiler pan with aluminum foil and place the insert on top. Alternatively, line a baking sheet or baking pan with foil and set aside.
In a large bowl lightly whisk the eggs. Add the oats, ketchup, onion, Worcestershire, salt and pepper. Stir to combine and then mix in the ground beef until well combined.
Use a small bowl to mix together the glaze ingredients - ketchup, brown sugar, apple cider vinegar, garlic powder, and onion powder.
Shape the meatloaf into a uniform loaf and place it on the prepared pan. Brush ⅓ of the meatloaf glaze over the top and sides. Bake for 45 minutes.
After 45 minutes, turn the oven up to 400ºF. Remove the meatloaf and brush on the remaining glaze. Return to the oven and bake for 20 minutes, or until the internal temperature reaches 160ºF. Cool for 10 minutes before slicing and serving.
