1. Preheat oven to 350° F. 

2. Use the olive oil to grease a 12-cup muffin pan.

3. In a large bowl, mix 1/2 cup ketchup with the remaining ingredients until well combined. Divide the mixture in half and form into six meatballs, and place one in each muffin cup. Repeat with the other half of the mixture until all 12 cups are full. Brush tops with remaining ketchup.

4. Transfer to the oven and bake for 45-50 minutes, until lightly browned on top and the inside temperature registers 170° F on an instant-read thermometer. Remove from the oven and place the turkey muffins on a serving platter. Serve hot.