Preheat oven to 375°.
Combine 3 tablespoons ketchup, oats, and next 10 ingredients (oats through garlic) in a large bowl; stir mixture until well-blended.
Shape meat mixture into a 9 x 5-inch loaf on a broiler pan coated with cooking spray; spoon 4 tablespoons ketchup over meat loaf. Insert a meat thermometer into loaf. Bake at 375° for 1 hour and 10 minutes or until a thermometer registers 160°. Let stand 10 minutes. Remove meat loaf from pan; cut into 16 slices.