Preheat oven to 325°F. If using a Butterball frozen turkey breast, you can cook it from frozen per package instructions (netting still on). Place turkey breast roast on rack in shallow roasting pan. Brush with oil. Cooking From Frozen: If using a still-frozen turkey breast roast, start by cooking uncovered for 3 1/2 hours.Cooking From Thawed: If using a thawed turkey breast roast, first cook for 15 minutes uncovered.
Prepare the Glaze
Meanwhile, combine maple syrup, butter and mustard in a small saucepan. Cook over medium-high heat until butter is melted and mixture thickens slightly.
Glaze the Turkey Breast Roast
Brush some of the maple glaze over roast and continue cooking for about 30 minutes more, until meat thermometer reads 165°F. Let stand for 10 to 15 minutes before removing the netting and slicing.
Make a Sauce
Add ¼ cup of water to remaining glaze and bring to a boil. Simmer for 5 minutes or until syrupy again and drizzle over turkey.
Notes
*Note: you can use this glaze with a fresh, bone-in turkey breast, too, but the cooking time and method will be different.