Add chicken breasts, 1/2 teaspoon salt, 1/4 teaspoon pepper, 1 tablespoon butter, and 1/4 cup chicken broth to a slow cooker.
Cover and cook for 4 to 6 hours on LOW.
Once the chicken is cooked through, use two forks to shredded the chicken. (You can do this right in your slow cooker or on a plate.) Continue as directed below.
Queso Chicken
Add cooked & shredded chicken to the slow cooker along with the taco seasoning, Rotel tomatoes, and queso dip. Stir everything together.
Cover and cook on HIGH for 1 hour and 30 minutes. Check the chicken after 1 hour. If it seems a little dry, pour in the broth. You want the finished chicken to be nice and creamy!
Once the cooking time is up, stir everything together.
Tacos
To make your tacos, add some queso chicken onto and flour tortilla. Top with shredded cheese, shredded lettuce, tomatoes, and jalapeno. Serve immediately.
Notes
You can use pre-cooked boneless skinless chicken breasts or a rotisserie chicken from the store To cut down on your prep time. Just be sure to discard the skin if using a whole chicken.