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Healthy Slow Cooker Turkey Meatballs - Tender, Saucy, and Easy

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Prep Time 20 minutes
Cook Time 4 hours
Total Time 4 hours 20 minutes
Servings: 6 servings
Ingredients Method

Ingredients
  

  • For the meatballs:
  • 1 1/2 pounds lean ground turkey (93% lean recommended)
  • 1/2 cup old-fashioned rolled oats, finely chopped or pulsed (or whole wheat breadcrumbs)
  • 1/3 cup finely grated Parmesan cheese
  • 1 large egg
  • 1/4 cup finely minced onion
  • 2 cloves garlic, minced
  • 2 tablespoons chopped fresh parsley (or 2 teaspoons dried)
  • 1 teaspoon dried Italian seasoning
  • 1/2 teaspoon kosher salt
  • 1/2 teaspoon black pepper
  • 1–2 tablespoons milk or broth (as needed for moisture)
  • For the sauce:
  • 1 (28-ounce) can crushed tomatoes
  • 1 (15-ounce) can tomato sauce or passata
  • 1 tablespoon tomato paste
  • 1 teaspoon dried basil
  • 1 teaspoon dried oregano
  • 1 teaspoon sugar or honey (optional, to balance acidity)
  • 1/2 teaspoon kosher salt, plus more to taste
  • 1/4 teaspoon red pepper flakes (optional, for a gentle kick)
  • 1–2 tablespoons extra-virgin olive oil (optional, for richness)
  • To serve (optional): Cooked whole wheat pasta or zucchini noodles, extra Parmesan, chopped basil, and a squeeze of lemon.

Method
 

  1. Prep the sauce base: In your slow cooker, stir together crushed tomatoes, tomato sauce, tomato paste, basil, oregano, optional sugar, salt, red pepper flakes, and olive oil. Spread into an even layer.
  2. Make the binder: Pulse rolled oats in a blender or food processor a few times until sandy. This helps create a tender texture similar to breadcrumbs.
  3. Mix the meatball mixture: In a large bowl, combine ground turkey, pulsed oats, Parmesan, egg, onion, garlic, parsley, Italian seasoning, salt, and pepper. Add 1 tablespoon milk or broth. Gently mix with a fork or your hands until just combined. If it feels dry, add another splash of milk.
  4. Shape the meatballs: Scoop about 2 tablespoons per meatball and roll lightly with damp hands. Aim for 20–24 meatballs so they cook evenly.
  5. Nestle in the sauce: Place meatballs in a single layer into the sauce, turning each one to lightly coat. It’s fine if they touch, but avoid stacking.
  6. Cook low and slow: Cover and cook on Low for 4–5 hours or on High for 2–3 hours, until the meatballs reach an internal temperature of 165°F (74°C) and feel firm but springy.
  7. Taste and finish: Stir gently, then taste the sauce. Adjust salt, add a pinch of sugar if acidic, or a squeeze of lemon for brightness. Fold in fresh basil if you have it.
  8. Serve: Spoon over pasta, zoodles, or spaghetti squash. Top with extra Parmesan and cracked pepper. For a lighter plate, add a simple green salad on the side.