Step 1

Combine turkey, ¼ tsp. salt, pepper, egg, breadcrumbs, garlic, parsley, and cheese in a large bowl; mix well with clean hands.

Step 2

Roll mixture into eighteen 1½-inch meatballs. Set aside.

Step 3

Heat oil in large nonstick skillet over medium-high heat.

Step 4

Add half of meatballs; cook, turning occasionally, for 4 to 6 minutes, or until meatballs are browned on each side. Place browned meatballs in a 3-quart slow cooker.

Step 5

Repeat with the remaining meatballs. Set aside.

Step 6

Add onion to same skillet; cook, over medium-high heat, for 4 to 6 minutes, or until onion is translucent.

Step 7

Top meatballs with cooked onion, tomatoes, oregano, and remaining ¼ tsp. salt; cook, covered, on low temperature for 5 to 6 hours, stirring once or twice.