Heat a heavy sauce pan on medium heat
Add butter, melt but don't brown it
Add flour and whisk for 1 minute until thickened
Add chicken broth, garlic powder, onion powder and salt and whisk until smooth
Let it come to a boil and whisk it as it thickens. (About 5 minutes)
Take off heat and let cool for 5 minutes
Add sour cream and stir it in
Put pan back on low heat and add cheese and stir until melted
Add ½ cup or less of chicken broth to thin the sour cream sauce to your liking
Ladle on enchiladas or dish of your choice
