How long must you cook a turkey breast if you want to keep it moist?

For best results, roast an unstuffed 3- to 5 ½-pound turkey breast for 1 ½ to 2 ¼ hours in a regular oven at 325 F. Roast a 5 ½- to 9-pound unstuffed breast for 2 ¼ to 2 ¾ hours. Allow an extra 30 minutes for stuffed breasts.

When roasting a frozen turkey breast at 325 F, allow 3 to 3 ¾ hours for a 3- to 5 ½-pound breast or 3 ¾ to 4 ½ hours for a 5 ½- to 9-pound breast. Roast the breast uncovered with the skin side down, and allow it to stand for 10 minutes prior to carving.