Heat oil in a large skillet over medium heat. Add garlic, onion, bell pepper, carrots, mushrooms and corn. Saute for 5 minutes until vegetables are slightly tender and onions are translucent. Remove from heat and set aside.
Stir together tomato sauce, tomato paste, cumin, mustard, vinegar, molasses, Whrcestershire sauce, black pepper and chipotle if desired, in a large bowl.
Add ground turkey to slow cooker, breaking up into smaller pieces with a large spoon or spatula. Add sauteed vegetables, tomato mixutre and black beans; stir to combine.
Cover and cook 4 hours on HIGH or 8 hours on LOW.
To serve, scoop a 1/2 cup portion on to a sliced bun.
Recipe provide courtesy of Rebecca Scritchfield, MA, RD, ACSM Health Fitness Specialist