slow cooked turkey sloppy joes

Ingredients

• 1 pound lean ground turkey
• 1 small onion, chopped
• 1/2 cup chopped celery
• 1/4 cup chopped green pepper
• 1 can (10-3/4 ounces) reduced-sodium condensed tomato soup, undiluted
• 1/2 cup ketchup
• 2 tablespoons prepared mustard
• 1 tablespoon brown sugar
• 1/4 teaspoon pepper