1. Preheat oven to 325°.
2. Place turkey breast on plastic wrap. From center, slice horizontally through thickest part of each side, almost to outer edge; flip each cut piece. Flatten to 1/2-inch thickness, using a mallet or rolling pin.
3. Coat a large nonstick skillet with cooking spray; add 1 teaspoon butter. Place over medium-high heat until hot. Add onion, mushrooms, and carrot; sauté until crisp-tender. Stir in breadcrumbs and next 7 ingredients. Spoon over turkey, leaving a 2-inch border at sides; roll up, jelly roll fashion, starting at short side. Tie at 2-inch intervals with string. Place, seam side down, on a broiler pan coated with cooking spray.
4. Bake at 325° for 45 minutes. Combine 2 tablespoons butter and Worcestershire sauce; brush over turkey. Bake an additional 1 1/2 hours or until a meat thermometer registers 180°, brushing with butter mixture after 1 hour. Remove string; let stand 10 minutes before slicing into 8 equal portions.
carbo rating: 4