Prepare all of the ingredients. Preheat oven to 400 deg.
In a sauce pan over medium heat, combine all the ingredients for the BBQ sauce. Whisk until fully combined and bring to just a bubble. Reduce heat and let simmer until ready to build enchiladas.
In another sauce pan over medium-high heat, add chicken and chicken broth. Cook for 20 minutes. Remove chicken and shred it.
Start with a thin layer of sauce in the bottom of a 13x9 baking dish. Fill each tortilla with a portion of chicken and a sprinkle of red onions. Line them up in the baking dish. Pour remaining sauce over enchiladas. Sprinkle with cheese, remaining red onions and scallions. Place in oven and cook for 15 minutes.