Preheat the oven to 350 degrees F (175 degrees C). Lightly grease a 12-cup muffin tin.

Heat oil in a skillet over medium-high heat. Saute onion and bell pepper in the hot oil until softened, 5 to 7 minutes. Remove from heat and let cool slightly, about 10 minutes.

Combine sauteed onion mixture, turkey, sausage, oats, 1/2 cup ketchup, carrot, egg, Worcestershire sauce, garlic, salt, and pepper in a large bowl. Mix lightly and thoroughly.

Spoon mixture evenly into the prepared muffin tin using an ice cream scoop, filling each to the top, mounding if necessary. Top each with a drizzle of ketchup and about 1/5 slice of bacon.

Bake in the preheated oven until muffins are browned on tops and no longer pink in the centers, about 30 minutes.