To prepare roux, melt butter into a medium saucepan over medium heat. Once melted whisk in flour, salt and pepper. Stir and cook for 3-4 minutes until color of roux will gets slightly darker. Slowly whisk in broth, stirring continuously until thickened, about 2 minutes. Reduce heat to a simmer and stir in cheese until melted.

Please note, if you choose the homemade sauce, you have to prepare it first, you can't just add all of the ingredients to the crockpot. You'll also cook your chicken breast in the broth first, shred then add the homemade cheese sauce. Before serving add sour cream and steamed broccoli.