The most tender and deliciously seasoned crockpot turkey breast.
Make sure the turkey breast is completely thawed -- this can take 1-2 days in the fridge so be prepared. It isn't food safe to thaw a turkey in the crockpot. See notes in the post for more details about thawing your turkey breast. Pat the turkey down with paper towels.
Place the turkey breast, BREAST DOWN on top of the vegetables. Make sure the turkey is ELEVATED on top of the onion/vegetables.
Cover the crockpot and cook on high for 1 hour and then low for 5-7 hours or until the turkey's internal temperature reaches 165 degrees F.
TO MAKE GRAVY: Strain everything from the crockpot out into a large bowl (press down the veggies to extract all the flavor/liquid). Measure that liquid (you should have right around 2 cups) and then set aside. In a large saucepan, add 4 tablespoons butter and melt. Whisking constantly, add in 4 tablespoons white flour. Gradually add in the strained liquid from the crockpot, whisking constantly. Add salt, pepper, and any other seasonings needed. Serve warm with the turkey.