Combine the butter, garlic, paprika, thyme, salt and pepper together in a small bowl.
Place the sliced onions at the bottom of a 6 quart crock pot. Place the turkey breast on top.
Pour the butter mixture over the top of the ingredients in the crock pot.
Cover and cook on low for 5-6 hours or on high for 2.5-3 hours until the turkey breast reaching an internal temperature of 165 degrees F.
Remove the turkey breast from the crock pot and let sit for 5 minutes before slicing.
Transfer 1 cup of the sauce from the crock pot to a small saucepan and stir in the chicken broth.
Heat over medium high heat until the mixture starts to boil slightly.
Combine the cornstarch and water together in a small bowl. Whisk the cornstarch mixture into the saucepan and heat for 3-4 minutes, stirring constantly until the sauce thickens to the consistency that you prefer.
Slice the turkey and serve with the gravy drizzled over the top and enjoy!
Video
Notes
You can also use a bone-in turkey breast for this recipe.