Preheat oven to 375F. Spray 9 cups of a muffin tin with oil and set aside. 

In a large mixing bowl, combine ground turkey, onion, panko breadcrumbs, Italian seasoning, worcestershire sauce, salt, black pepper, and egg. Mix thoroughly but make sure not to overwork the meat. 

Once fully combined, use a ⅓ cup measure to scoop the meat mixture out and put in the prepared muffin tin. Repeat with all of the meat mixture. 

In a separate small bowl, stir together ketchup, brown sugar, and dijon mustard. Brush or spoon on top of each meatloaf muffin. 

Bake 20 - 25 minutes, or until a meat thermometer reads 165F. Serve hot.