Heat oven to 350°F. Bake loaf as directed on can. Cool 10 minutes.
Heat broiler. On ungreased broiler pan, combine bell pepper, onion and mushrooms. Brush with oil; sprinkle with rosemary. Broil 4 to 6 inches from heat for 8 to 10 minutes or until bell pepper and onion are fork-tender, stirring occasionally.
Return oven temperature to 350°F. Cut loaf in half lengthwise. Spread bottom half with cream cheese. Layer with turkey, bell pepper mixture, cheese and top of loaf. Place filled loaf on ungreased cookie sheet.
Bake at 350°F. for 2 to 3 minutes or until cheese is melted. Cut sandwich into 4 pieces.