Slow Cooker Mozzarella French Onion Turkey Breast

This slow cooker turkey breast is the ultimate hands-off dinner. Just layer turkey cutlets, sweet onions, French onion soup, mozzarella, and garlic herb butter into the crock, then walk away.

Hours later, the turkey is fork-tender and bathed in a rich, cheesy onion sauce. Serve it over garlic butter penne for a complete meal that tastes like you fussed—but you didn't.

Slow cookers are made for days like this. With just a few pantry staples and about ten minutes of prep, you can have a dinner that tastes like it simmered all day—because it did.

The turkey breast cooks low and slow until it practically falls apart, while the onions melt into sweet, jammy ribbons and the mozzarella turns the broth into a creamy, savory sauce. This recipe is perfect for busy weeknights, lazy weekends, or anytime you want a comforting meal without standing over the stove.

Ingredients

Why this recipe works

The slow cooker does all the work here. Cooking the turkey breast on low heat for several hours breaks down the connective tissue, leaving the meat moist and tender enough to shred with a fork.

Unlike chicken breast, turkey breast can dry out if cooked too quickly, but the gentle, moist environment of the slow cooker prevents that. The onions also benefit from the long cook time, slowly caramelizing and releasing their natural sweetness into the sauce.

The combination of condensed French onion soup and garlic herb butter creates a deeply savory, umami-rich broth that the turkey absorbs as it cooks. The mozzarella melts into the sauce, adding richness and body without overpowering the other flavors. Serving the turkey over garlic butter penne ties everything together, giving you a satisfying, hearty meal in one bowl.

Notes and substitutions

Use boneless, skinless turkey breast cutlets for even cooking and easy shredding. If you have a larger turkey breast, you can increase the cook time slightly, but check for doneness with a meat thermometer.

Vidalia onions are sweet and mild, perfect for this dish, but any sweet onion will work. If you prefer a stronger onion flavor, use yellow onions and cook them a bit longer.

The garlic herb butter adds a nice aromatic touch, but you can substitute plain butter with a pinch of garlic powder and dried herbs. For a lighter version, use part-skim mozzarella, but whole-milk mozzarella gives the sauce a creamier texture. The penne pasta is optional—serve the turkey over mashed potatoes, rice, or crusty bread if you prefer.

• Vidalia onions: Any sweet onion, such as Walla Walla or Maui, or yellow onions for a sharper flavor.
• Garlic herb butter: Mix 2 tablespoons softened butter with 1 minced garlic clove and 1 teaspoon dried herbs (thyme or parsley).
• Condensed French onion soup: Use 1 can (10.5 oz) of beef consommé plus 1 packet of dry onion soup mix.
• Whole-milk mozzarella: Part-skim mozzarella or a blend of Italian cheeses works well; avoid fresh mozzarella as it can make the sauce watery.

Equipment

• 7-quart slow cooker
• Cutting board
• Chef's knife
• Measuring cups
• Measuring spoons
• Serving spoon