Ninja Slow Cooker Turkey Breast with Easy Herb Gravy

This Ninja slow cooker turkey breast is seasoned with garlic, thyme, rosemary, and butter, then cooked gently over onion in a little broth until tender. The cooker keeps the meat moist, while the flavorful juices make a simple stovetop gravy for serving; it is a practical centerpiece for a holiday meal or an easy Sunday dinner.

Ingredients

1 boneless, skin-on turkey breast roast, 3½–4 lb (1.6–1.8 kg), fully thawed and preferably tied
1 medium yellow onion, about 6 oz (170 g), sliced into thick rounds
1 cup low-sodium chicken or turkey broth (240 ml), plus up to ½ cup (120 ml) more for thinning the gravy
3 tbsp unsalted butter, softened (42 g)
1 tsp fine salt (6 g), or less if the broth is salted
½ tsp ground black pepper (1 g)
1 tsp dried thyme (1 g)
½ tsp dried rosemary, crushed between your fingers (about 0.5 g)
1 tsp garlic powder (3 g)
2 tbsp all-purpose flour (16 g)
1 tbsp chopped fresh parsley (4 g), optional, for the gravy

Instructions

Thaw and prepare the turkey. If frozen, thaw the roast completely in the refrigerator before cooking; do not put a frozen turkey breast in a slow cooker. Remove the packaging and any gravy packet, then pat the turkey dry with paper towels. If it has a netting or is tied, leave it in place during cooking so the roast holds its shape. Check the appliance manual for the correct slow-cook setup for your Ninja model; use its slow-cook setting, not a pressure-cooking setting.
Make the herb butter. In a small bowl, stir together the softened butter, salt, pepper, thyme, rosemary, and garlic powder. Loosen the skin gently with your fingers without tearing it, if the roast has skin. Spread about two-thirds of the seasoned butter under the skin and rub the remaining butter over the outside. If the roast is skinless, spread all the butter over its surface. Seasoning under the skin adds flavor directly to the meat, while butter on top helps carry the herbs across the roast.
Set up the cooker. Arrange the onion slices in an even layer in the Ninja slow-cooker pot. Pour in 1 cup (240 ml) broth. Set the turkey on top of the onions, skin side up when applicable. The liquid should sit below the roast rather than cover it; the turkey will release additional juices as it cooks. Do not add extra liquid just to submerge the meat, since that can dilute the cooking juices needed for gravy.
Slow-cook until safely done. Cover the pot using the slow-cook lid arrangement specified for your model. Cook on LOW for about 4 hours 45 minutes. Start checking the temperature at about 4 hours because roast shape, starting temperature, and cooker models vary. Insert an instant-read food thermometer into the thickest part of the breast, avoiding the pot and any bone. The USDA FSIS safe minimum internal temperature for turkey is 165°F (74°C); continue cooking and recheck if it has not reached that temperature. Do not rely on color or the timer alone.
Rest the turkey. Once it reaches 165°F (74°C), lift the roast onto a cutting board and tent it loosely with foil. Rest it for 15 minutes before slicing. This gives the juices time to settle and makes the roast easier to carve. Keep the onions and cooking liquid in the pot while the turkey rests.
Make the gravy. Strain the cooking liquid into a heatproof measuring jug, pressing the onions lightly to extract their flavor, and skim off excess fat if needed. Measure 1½ cups (360 ml) liquid, using the reserved broth to make up the amount if the cooker has produced less. In a small saucepan over medium heat, melt 2 tablespoons butter (28 g), whisk in 2 tablespoons flour (16 g), and cook, whisking, for 1 minute. Gradually whisk in the measured liquid. Bring it to a gentle simmer and cook for 4–6 minutes, whisking often, until smooth and thick enough to coat a spoon. Stir in parsley if using. If it gets thicker than you like, whisk in a little more broth.
Slice and serve. Remove the netting or ties, if present, and slice the turkey across the grain into pieces about ¼–½ inch (6–12 mm) thick. Arrange on a warm platter and serve the gravy alongside or spooned over the slices.

Tips

Use a thermometer, not just a clock. A compact, thick roast may finish sooner than a longer one, and individual Ninja models can run differently. Check the thickest area and make sure the probe is not touching bone. If one section is below 165°F (74°C), return the roast to the cooker and check again after 15–20 minutes.
Choose a fully thawed roast. Slow cookers heat gradually, so starting with frozen poultry can leave it too long in an unsafe temperature range. Thaw it in the refrigerator, allowing roughly 24 hours for every 4–5 lb (1.8–2.3 kg), and keep it refrigerated until you are ready to season it.
Adjust salt to the broth. Low-sodium broth gives you more control over the seasoning. If using regular broth, reduce the added salt to ½ teaspoon (3 g), taste the finished gravy, and add more only if needed. Unsalted butter is useful here for the same reason.
Expect soft skin from slow cooking. The moist environment cooks the turkey but will not crisp its skin. For browned skin, after the safe temperature is reached, transfer the roast to a foil-lined baking sheet and broil on high for 2–4 minutes, watching continuously. This optional step adds time and can brown quickly, so do not leave it unattended.

Serving Suggestions

Serve the sliced turkey with mashed potatoes, roasted potatoes, or buttered noodles, then pass the herb gravy at the table. Green beans, glazed carrots, roasted squash, or a crisp green salad balance the rich gravy with vegetables. For a holiday-style plate, add stuffing and cranberry sauce; for an everyday meal, warm rolls and a simple steamed vegetable are plenty.

The onion used under the turkey becomes very soft and intensely flavored. It can be discarded after straining the gravy, or served alongside if you like its texture. For a more substantial plate, spoon gravy over both the turkey and potatoes rather than pouring it over the entire platter, which helps any extra slices stay easier to store.

Variations

Use fresh herbs: Replace the dried thyme and rosemary with 1 tablespoon chopped fresh thyme leaves (about 3 g) and 1½ teaspoons chopped fresh rosemary (about 1.5 g). Fresh herbs taste brighter and can be mixed into the butter the same way. If you do not have rosemary, use more thyme instead; the flavor will be simpler but still savory.

Add citrus: Tuck two strips of lemon zest (about 2 g) into the cooker beside the onion, or add 1 teaspoon lemon juice (5 ml) to the finished gravy. Keep the amount modest so the sauce remains savory rather than sharply tart. A little lemon is especially nice with turkey served alongside vegetables.

Make the gravy gluten-free: Replace the flour-and-butter roux with a slurry made from 1 tablespoon cornstarch (8 g) and 2 tablespoons cold water (30 ml). Bring the strained cooking liquid to a simmer, whisk in the slurry gradually, and simmer for 1–2 minutes until thickened. Cornstarch gravy is more glossy and less creamy-tasting than a flour roux, and it may thicken further as it cools.

Try a bone-in breast: A fully thawed bone-in turkey breast can be used, but its shape and cooking time may differ. Start checking early and place the thermometer in the thickest meat without touching the bone; cook to 165°F (74°C). The recipe’s expected timing is for a 3½–4 lb (1.6–1.8 kg) boneless roast, so allow extra time if your bone-in cut is larger or especially thick.

Storage and Reheating

Refrigerate leftover turkey and gravy within 2 hours of cooking. Store them in separate shallow, covered containers and use within 3–4 days. Separating the gravy helps the sliced meat keep its texture and makes it easier to reheat only what you need. For longer storage, freeze the turkey and gravy in airtight containers for about 2–3 months for best quality; thaw overnight in the refrigerator.

Reheat turkey with a spoonful of broth or gravy in a covered oven-safe dish, or warm it gently in a covered skillet over low heat. Microwave portions in a covered dish, turning or stirring as appropriate so they heat evenly. Reheat leftovers to 165°F (74°C), checked with a food thermometer. Warm gravy in a saucepan over low to medium-low heat, whisking and adding a splash of broth if it has thickened. Avoid repeatedly heating and cooling the same large container; take out only the portion you plan to serve.

Frequently Asked Questions

Can I cook a frozen turkey breast in a Ninja slow cooker?
No. Thaw the turkey completely in the refrigerator before slow cooking. A frozen roast heats too slowly in a slow cooker, and the recipe’s timing cannot ensure it reaches a safe temperature promptly. Keep it cold while thawing, then pat it dry and season it just before cooking.

Can I use the HIGH setting instead of LOW?
LOW is preferred for this recipe because it gives a large breast time to cook evenly and makes it easier to avoid drying the outer meat. HIGH may work differently from one Ninja model to another, so do not convert the time by guesswork. Follow your appliance manual, begin checking early, and use 165°F (74°C) in the thickest part as the deciding point.

Can I cook this in a Ninja Foodi pressure cooker?
This recipe is written for the slow-cook function, not pressure cooking. Ninja Foodi models and accessories vary, so use the lid arrangement and settings specified in your model’s manual for slow cooking. A pressure-cooked turkey breast needs a different method and timing; do not simply choose the pressure setting and reuse these instructions.

Why is my turkey breast dry?
It may have cooked beyond 165°F (74°C), or it may have been sliced before resting. Check temperature as the roast approaches the expected finish time, and take it out once the thickest part reaches the safe minimum. Rest it for 15 minutes, then cut across the grain. Serving slices with warm gravy also helps keep the meal pleasant if the roast is a little lean.

Can I prepare the turkey the night before?
You can mix the herb butter and slice the onion ahead, storing each covered in the refrigerator. For best handling, season the fully thawed turkey shortly before cooking and keep it refrigerated until it goes into the cooker. Do not leave raw poultry at room temperature while preparing other parts of the meal.

What if I have less than 1½ cups of cooking liquid?
Use the reserved low-sodium broth to bring the strained juices to 1½ cups (360 ml), as directed. If you have more liquid, measure the amount needed for the gravy and refrigerate or discard the extra. If the finished gravy is too thin, simmer it a little longer; if it is too thick, whisk in broth a tablespoon at a time.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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