Preheat oven to 350° F. Coat a muffin tin with cooking spray, then set aside.
Heat olive oil in a large, nonstick skillet over medium-high heat.
Chop onion and carrot; mince garlic.
Add onion, carrot, garlic, and oregano to the hot oil; sauté for 2 minutes then set aside to cool.
Combine onion mixture, 1/2 the ketchup, and all remaining ingredients in a large bowl. (Use your hands to mix; it's messy, but it works great!)
Spoon the meat mixture into the prepared muffin cups, then top each with 2 teaspoons ketchup.
Bake for 25 minutes or until a meat thermometer reads 160° F when inserted into the middle of a "muffin". Let stand for 5 minutes before serving.
While the meat is cooking, steam the green beans and cook the potatoes as desired (baked, mashed, etc).
Serve "muffins" with green beans and potatoes on the side. (Serving size: 2 muffins, 1 potato, 1 cup green beans)