1. Preheat broiler to high.
2. Combine first 9 ingredients in a medium saucepan; stir with a whisk. Bring to a boil over high heat; cook 2 minutes or until thickened. Reserve 1 1/2 cups sauce mixture. Add chicken and beans to pan; cook 2 minutes or until chicken is thoroughly heated.
3. Stack tortillas; wrap stack in damp paper towels and microwave at HIGH for 25 seconds. Spoon about 1/3 cup chicken mixture in center of each tortilla; roll up. Arrange tortillas, seam sides down, in bottom of a 13 x 9-inch glass or ceramic baking dish coated with cooking spray. Top with reserved sauce and cheese. Broil 3 minutes or until cheese is lightly browned and sauce is bubbly. Top with tomato and cilantro. Serve with sour cream.