In a bowl, combine butter, garlic, thyme, salt, and pepper.
Mash until smooth and fully combined.Divide in half and refrigerate one portion for later.
Chilling the second half helps it sit on the skin longer when crisping.
Arrange garlic halves, thyme, rosemary, and lemon slices in the base of the slow cooker.
Pat the turkey completely dry with paper towels.
Rub the prepared herb butter all over the turkey and season generously with extra salt and pepper.
Place the turkey on top of the garlic and herb base inside the slow cooker.
Cover and cook on HIGH for 4 hours or LOW for 8 hours, until the internal temperature reaches 165°F (74°C).
Transfer the turkey carefully to a baking tray and brush the reserved butter over the hot turkey.
It will be very tender, so support it well to avoid tearing.
Place under the broiler for about 10 minutes, or until the skin is golden and crispy.
Watch closely, it can brown very quickly depending on your oven.
Strain the cooking liquid and set aside.
GRAVY
Melt butter in a saucepan over medium heat.
Add flour and whisk continuously for about 1 minute until combined and slightly golden.
Cooking the flour removes the raw taste and builds flavor.
Slowly pour in the strained turkey liquid while whisking constantly to prevent lumps.
Continue whisking over medium heat until the gravy begins to thicken.
Simmer until smooth and glossy, adjusting thickness as needed.
Stir in Worcestershire sauce and mix to combine.
Slice into thicker pieces or gently pull apart for a more rustic serve. Transfer to a serving platter and spoon over some of the gravy. Serve with extra gravy on the side.
Video
Notes
Recipe Notes
1. Turkey Size Guide
Standard Slow Cooker (6-7 qt): Stick to a turkey between 8–10 lbs (4–5 kg).
Large Slow Cooker (8-10 qt): You can fit a bird up to 12 lbs (5.5 kg).
Lid won’t close? Cover the gap tightly with heavy-duty aluminum foil to trap the steam.
2. Herb Substitutions
If you don't have fresh herbs, you can use dried herbs for the butter rub.
Ratio: Use 1 teaspoon of dried herbs for every 1 tablespoon of fresh herbs.
Note: I still recommend using fresh herbs (even just parsley) inside the cavity for better aroma.
3. Gluten-Free Gravy Option
Replace the all purpose flour with cornstarch.
Method: Mix 2 tablespoons of cornstarch with 2 tablespoons of cold water to create a slurry. Pour this into the simmering turkey liquid and whisk until thickened.
4. Storage & Reheating
Fridge: Store leftover meat in an airtight container for up to 3-4 days.
Freezer: Freeze in portions with a little gravy to keep it moist for up to 3 months.
Reheating: To prevent drying out, place turkey in a baking dish with a splash of broth (or leftover gravy), cover with foil, and bake at 350°F (175°C) until warmed through.
5. Troubleshooting
Skin browning too fast? If the broiler is burning the skin before it's crispy, switch your oven to Bake at 420°F (220°C) for 10-15 minutes to finish gently.
Let the turkey rest for 15–20 minutes before carving. This helps the juices redistribute and keeps the meat juicy.