Pat the turkey breast dry with paper towels. In a small bowl, whisk together the melted butter, olive oil, salt, pepper, paprika, garlic powder, onion powder and oregano. Rub the mixture all over the turkey.
Add the carrots, leek, onion, garlic, rosemary and thyme to the slow cooker. Pour in the broth.
Set the turkey on top of the vegetables. Cover and cook on LOW for 4 to 5 hours, checking from 3½ hours, until the thickest part reaches 160°F.
Meanwhile, stir together the melted butter, hot honey and chili crunch.
Transfer turkey to a sheet pan. Remove netting. Brush turkey with the hot honey chili crunch glaze and transfer to the oven. broil for 3 to 5 minutes, watching closely, until bubbling and caramelized.
While the turkey is in the oven, make the gravy. Drain the contents of the slow cooker. Transfer the cooking liquid to a small pot on the stovetop. Serve it as is, or for a thicker gravy, whisk in 1 tablespoon cornstarch and cook on low, whisking often, until thickened, about 10 minutes.
Rest the turkey for 15 minutes; it will reach 165°F. Slice and serve with the gravy and fresh sage.