The slow cooker lid comes off, and the onion underneath the turkey has turned soft and fragrant while the breast is still resting above it. That gentle bed of onion and broth gives the meat a little moisture as it cooks and leaves you with the beginnings of a gravy. I make this Slow Cooker Turkey Breast with Onion Gravy when I want a satisfying turkey dinner without keeping the oven occupied.
The gravy is what makes this version feel complete. Instead of relying on cooking liquid alone, I whisk a measured cup of it with butter, flour, and more chicken broth, then stir in the chopped onion. The result is a smooth, savory gravy with tender bits of onion, ready just as the turkey is carved. Slice the breast across the grain and spoon that gravy over the top.
Kitchen Note
Give the turkey its full 15-minute rest before carving. I get neater slices when I let the breast settle on the cutting board instead of cutting into it straight from the slow cooker.
Save this slow cooker turkey breast with onion gravy for tender slices and a rich, homemade gravy built from the cooking liquid.
Why Slow-Cooker Turkey Skin Won’t Turn Roast-Crisp
A slow cooker surrounds the turkey with moist heat, so the skin won’t become crisp and browned the way it does in an oven. That’s a difference in cooking environment, not a sign that the breast has gone wrong. I keep the skin facing up because that’s how this breast sits over the onion, but I don’t count on crisp skin as the payoff.
What you get instead is tender meat and a flavorful cooking liquid for the gravy. The skin helps cover the top of the breast during the long cook, while the onion and broth below collect the savory drippings. If crisp skin is the part you care about most, this slow-cooker method isn’t the right format; if you want tender turkey with gravy made from its cooking liquid, it’s a good trade.
The Onion and Broth Do Double Duty in This Gravy
- Yellow onion — It softens beneath the turkey and seasons the cooking liquid, then its chopped pieces give the finished gravy a little body. Slice it before it goes into the cooker, and chop it finely after cooking so it blends easily into each spoonful.
- Low-sodium chicken broth — The first portion creates the cooking liquid; the remaining portion lightens and extends that liquid in the gravy. Low-sodium broth gives the salt and turkey drippings room to come through without making the finished gravy taste overly salty.
- Bone-in turkey breast — The bone-in, 4- to 5-pound breast is the size and cut this cooking schedule is built around. Choose one that’s fully thawed, and pat its surface dry before adding the oil and seasonings.
- Olive oil and dried thyme — The oil helps the seasonings cling to the turkey, while thyme gives the meat a gentle herbal note. The dried thyme is convenient here; there’s no chopping or extra prep before it goes on.
- Garlic powder, kosher salt, and black pepper — These season the turkey directly, so each carved slice has flavor beyond the gravy. Garlic powder coats the surface evenly, and the kosher salt and pepper give the simple seasoning its savory backbone.
- Unsalted butter and all-purpose flour — Together, they make the roux that thickens the gravy. Unsalted butter lets you keep the seasoning from the broth and turkey in balance, and the flour needs a short cook in the melted butter before the liquid goes in.
From Onion Bed to Gravy-Slicked Slices
Set Up the Turkey Over the Onion
Put the sliced onion and the first portion of chicken broth into a 6-quart slow cooker. Pat the thawed turkey breast dry, rub it with olive oil, then coat it with dried thyme, garlic powder, kosher salt, and black pepper. Set it skin-side up over the onion. Keep the onion spread underneath the breast rather than piling it on top.
Cook Until the Thickest Part Is Ready
Cover the slow cooker and cook on LOW for 5 to 6 hours or HIGH for 3 to 4 hours. Check the thickest part of the breast with a thermometer, keeping the tip away from the bone; it needs to reach 165°F. A bone can interfere with an accurate reading, so take a moment to position the thermometer in the meat itself. Transfer the turkey to a cutting board to rest for 15 minutes.
Build a Roux While You Prepare the Onion
Lift the cooked onion onto a cutting board and finely chop it. Strain the slow-cooker liquid, skim off excess fat, and measure 1 cup for the gravy. In a 2-quart saucepan over medium heat, melt the butter, whisk in the flour, and cook the mixture for 1 minute. The roux should look smooth before you start adding liquid.
Whisk the Gravy Until It Thickens
Gradually whisk the measured cooking liquid into the roux, followed by the remaining chicken broth. Add the chopped onion and simmer for 3 to 5 minutes, whisking often, until the gravy thickens. If the liquid goes in all at once, the roux is harder to blend smoothly, so add it in a steady stream while whisking. Carve the rested turkey and serve it with the onion gravy.
Three Small Changes for a Different Plate
A Gluten-Free Plate Without the Flour Gravy
Use gluten-free low-sodium chicken broth in the same portions and serve the turkey without the flour-thickened gravy. The seasoned turkey and onions still cook together, but you’ll miss the gravy’s creamy thickness and chopped-onion finish.
Chunkier Onion Gravy
Chop the cooked onion less finely before stirring it into the gravy. You’ll get more distinct, tender onion pieces in each spoonful; the gravy will still thicken from the butter-and-flour roux.
A Milder, Thyme-Free Seasoning
Leave out the dried thyme if you prefer the turkey’s seasoning to lean more on garlic, salt, and pepper. The breast will have less of that earthy herbal note, while the onion gravy still brings its own savory character.
Storage and Reheating
- Refrigerator: Refrigerate turkey and gravy within 2 hours, in separate covered containers if possible. Use within 3 to 4 days; the turkey will lose a little moisture as it sits.
- Freezer: Freeze sliced turkey and gravy in separate airtight containers for up to 2 to 3 months for best quality. Thaw them in the refrigerator before reheating.
- Reheating: Warm the turkey gently in a covered saucepan with some gravy, and heat the gravy separately, whisking until smooth. High heat can dry out the slices and make the gravy harder to stir evenly.
Questions That Come Up With Slow-Cooker Turkey Breast
Slow Cooker Turkey Breast with Onion Gravy
Ingredients
Equipment
Method
- Place the sliced onion and 1 cup of the chicken broth in a 6-quart slow cooker.
- Pat the fully thawed turkey breast dry.
- Rub the turkey breast with the olive oil, thyme, garlic powder, salt, and pepper.
- Set the turkey breast skin-side up over the onion.
- Cover and cook on LOW for 5 to 6 hours or HIGH for 3 to 4 hours, until the thickest part of the breast reaches 165°F without touching the bone.
- Transfer the turkey to a cutting board and let it rest for 15 minutes.
- Transfer the cooked onion to a cutting board.
- Finely chop the cooked onion.
- Strain the slow-cooker liquid and skim off excess fat.
- Measure 1 cup of the strained slow-cooker cooking liquid.
- Melt the butter in a 2-quart saucepan over medium heat.
- Whisk in the flour and cook for 1 minute.
- Gradually whisk in the measured cooking liquid and the remaining 1 cup of chicken broth.
- Stir in the chopped onion.
- Simmer for 3 to 5 minutes, whisking often, until thickened.
- Carve the turkey.
- Serve the turkey with the onion gravy.
