Melt butter in large saucepan over medium-heat. Add the turkey and cook until browned, stirring frequently, about 5 minutes.
Add the onion and bell pepper and cook until softened, stirring occasionally, about 5 minutes. Add the tomatoes and cook 5 minutes. Stir in all remaining ingredients and simmer until thickened, at least an hour.
Notes
If you are preparing this recipe as GLUTEN-FREE, be sure to use brands of beans and barbecue sauce that are known to be GF.