Place 1 large yellow onion in the bottom of your slow cooker.
Rinse clean the 1 double breasted bone-in turkey breast and place on top of the onion, breast side up. Top breast meat with 1 teaspoon smoked paprika, 1 teaspoon dried thyme, 1 teaspoon garlic powder, 1 teaspoon kosher salt, and 1 teaspoon freshly ground pepper. Drizzle 1 tablespoon olive oil over the top.
Insert meat thermometer into thickest part of breast.
Cover with lid and set the slow cooker to low for 4-5 hours. Continue to cook on low until internal temperature reads 165 degrees F.
Video
Notes
Recipe for 2 bone-in turkey breasts
Cooking tips:
You can follow the same recipe to prepare a boneless turkey breast, however it will cook much faster and might not be as moist.
The herbs and spices in this recipe give the turkey great flavor, but if you want to go the extra mile, mix up my One Spoon Dry Rub to use instead.
When cooking large cuts of meat like this, I try to allow them to come to room temperature before cooking.