Before getting started, preheat your oven to 350ºF, and grease up your muffin tin with nonstick cooking spray.
Start by adding the ground beef, egg, onion and seasoned salt to a large mixing bowl, and mix with a large wooden spoon 'til well combined.
Add the Worcestershire sauce, 1/4 cup of ketchup, barbecue sauce and oatmeal to the large bowl, mixing 'til evenly dispersed throughout the meat mixture.
Use a spoon to scoop your meatloaf mixture into the greased muffin cups.
Squirt an additional 1/4 cup ketchup all over the tops of each muffin and bake at 350ºF for 20-25 minutes, or until the internal temperature reads at least 165ºF with a meat thermometer.
That's it! Garnish with fresh parsley, serve and enjoy!