The lid comes off, and the turkey smells like garlic and rosemary—but the skin is pale, not crisp. That’s expected with a covered slow cooker; it gives you tender turkey, not roasted skin. I finish this slow cooker turkey breast with garlic herb butter under the broiler, where a few closely watched minutes turn the skin golden without changing the gentle cooking method.
Softened butter is easy to mix with the herbs and spread beneath the skin, right against the meat. I put most of it there and leave the rest on top, so the garlic and herbs season the breast from both sides. Thick onion slices and chicken broth make a simple base in the cooker while the turkey stays skin-side up. Once it’s rested and carved, the slices are tender, savory, and fragrant with fresh herbs.
Kitchen Note
Keep the butter softened, not melted. It should hold its shape when you stir in the herbs, then spread easily under the skin instead of running off the turkey.
Save this slow cooker turkey breast with garlic herb butter for tender slices, fresh rosemary and thyme, and skin browned under the broiler.
The Slow Cooker Won’t Brown Turkey Skin—Plan for the Broiler
A slow cooker traps moisture under its lid, which is useful for a lean turkey breast but not for crisping skin. Even with herb butter spread over the outside, the skin cooks in that humid environment and comes out soft. Don’t judge the turkey by its color when you lift the lid; the meat is checked with a thermometer, not by the skin’s appearance.
The broiler does a different job from the slow cooker. It exposes the skin to direct, intense heat after the turkey is cooked, so you can brown the surface without extending the slow-cooking time. Keep a close eye on it, because the skin can go from pale to browned quickly. If you’d rather skip that finish, the turkey is still ready to carve; the tradeoff is simply softer, unbrowned skin.
There’s also no need to submerge the breast in broth. The onion slices sit underneath it, and the broth goes into the bottom of the cooker. That arrangement gives the turkey a bed to rest on while the covered cooker does its work, instead of treating the breast like a poached cut.
Why Fresh Herbs and Softened Butter Belong Under the Skin
- Unsalted butter and garlic — The butter carries the minced garlic and chopped herbs across the breast, while unsalted butter lets the kosher salt stay in control. A standard grocery-store butter works well here; if you need a dairy-free version, use a dairy-free butter stick, though the flavor will be a little less buttery.
- Thyme, rosemary, and parsley — Fresh herbs bring a brighter aroma and soft green flecks to the butter than dried herbs do. Choose herbs with leaves that look fresh rather than wilted, and chop them finely so they spread evenly. If one herb is missing, keep the others in the mix rather than reaching for an unrelated seasoning.
- Bone-in, skin-on turkey breast — The skin gives you a place to spread the butter, and the bone-in cut is the one this cooking time is built around. Pick a breast in the listed size range so it fits the slow cooker and cooks on the same schedule. Patting the skin dry before adding the butter helps keep the herb mixture where you put it.
- Yellow onion and low-sodium chicken broth — Thick onion slices form the base beneath the turkey, and the broth supplies the liquid in the cooker. Low-sodium broth is a sensible choice alongside salted herb butter; regular chicken broth also works, but the finished cooking liquid will taste saltier.
Build the Herb Butter Before the Turkey Goes In
Stir the Garlic and Herbs Into the Butter
Combine the softened butter with the minced garlic, chopped thyme, rosemary, parsley, kosher salt, and black pepper in a small bowl. Stir until the herbs and seasoning are distributed throughout, with no big pocket of garlic or salt left at the bottom. If the butter is too firm to mix, give it more time to soften rather than melting it. You want a spreadable mixture that will stay put when you work it under the skin.
Make an Onion Bed in the Cooker
Arrange the thickly sliced yellow onion across the bottom of a 6-quart slow cooker, then pour in the chicken broth. Spread the slices into an even layer so the turkey can sit on top of them. The onions don’t need to be finely cut; thick pieces are easier to arrange and hold their shape under the breast. Keep the skin side facing up when you add the turkey.
Spread the Butter Beneath and Over the Skin
Pat the turkey breast dry, then gently loosen the skin without tearing it. Work about two-thirds of the herb butter underneath, spreading it over the breast meat as evenly as you can. Rub the remaining butter over the outside of the skin. If the skin feels tight, ease it back in small movements instead of pulling hard; a tear makes it harder to keep the butter under the skin.
Cook Until the Thickest Part Reaches Temperature
Set the turkey skin-side up on the onions, cover the slow cooker, and cook on LOW for 5 to 6 hours or HIGH for 3 to 4 hours. Insert a thermometer into the thickest part of the breast, keeping the probe away from the bone; the reading should reach 165°F. For browned skin, move the turkey to a rimmed baking sheet and broil for 3 to 5 minutes, watching closely. Let it rest for 15 minutes before carving so the slices stay moist.
Three Small Changes to Suit Your Table
Make It Dairy-Free
Replace the unsalted butter with a dairy-free butter stick and use it softened, just as you would dairy butter. The herbs will still coat the turkey, though the finished butter will have a slightly different richness and flavor.
Let Rosemary Lead
For a more piney, woodsy herb butter, increase the rosemary while cutting back on the parsley. Keep the thyme in the mixture to round out the stronger rosemary flavor, and chop the leaves finely so they’re easy to spread.
Turn Down the Garlic
Use less minced garlic in the butter if you prefer a gentler garlic flavor. Leave the thyme, rosemary, and parsley in place so the turkey still has its fresh-herb character; the butter will taste milder without losing its savory base.
Storage and Reheating
- Refrigerator: Store carved turkey in a covered container for 3 to 4 days. The slices may feel a little firmer once chilled.
- Freezer: Freeze carved portions in an airtight freezer-safe container for up to 2 to 3 months for best quality. A little of the cooking broth helps keep the meat from drying out as it freezes.
- Reheating: Warm portions covered with a little broth until hot throughout. Gentle heat helps keep the breast moist; avoid leaving uncovered slices in a hot oven, where they dry out quickly.
Questions That Come Up With Slow Cooker Turkey Breast
Slow Cooker Turkey Breast with Garlic Herb Butter
Ingredients
Equipment
Method
- Stir the softened butter, minced garlic, chopped thyme, rosemary, and parsley, salt, and pepper together in a small bowl.
- Arrange the thickly sliced onion in the bottom of a 6-quart slow cooker and pour in the chicken broth.
- Pat the turkey breast dry, loosen the skin without tearing it, and spread about two-thirds of the herb butter under the skin and the rest over the skin.
- Set the turkey breast skin-side up on the onions, cover, and cook on LOW for 5 to 6 hours or HIGH for 3 to 4 hours, until a thermometer inserted into the thickest part of the breast, away from the bone, reads 165°F.
- For browned skin, transfer the turkey to a rimmed baking sheet and broil for 3 to 5 minutes, watching closely, until the skin is browned.
- Rest the turkey for 15 minutes before carving.