1. Preheat the oven to 350ºF.
2. In a small bowl, stir together the oats and milk.
3. Thinly slice 1/4 of the onion and set aside. Finely chop the remaining onion.
4. In a large bowl combine the turkey, oat mixture, chopped onion, bell pepper, eggs, Worcestershire sauce, ketchup, salt and a few grinds of pepper. Mix just until well combined.
5. Transfer the mixture to a 9 by 13-inch baking dish and shape into a loaf about 5 inches wide and 2 1/2 inches high. Pour the tomato sauce over the meatloaf and sprinkle with the sliced onions.
6. Bake for about 1 hour or until an instant-read thermometer registers 160ºF.
7. Remove from the oven and let rest for 10 to 15 minutes before slicing.

Makes 8 1-inch thick slices.