Add the butter to the skillet and melt.
Add the flour to the melted butter and whisk to combine. Cook for 1 minute.
Lower the heat on the skillet and the broth and whisk.
Cook until it is bubbly.
Cool sauce for 3-5 minutes until room temperature.
Add sour cream and green chilies.
Stir until combined.
The sauce should smooth and sour cream is completely dissolved.
Pour the sauce over enchiladas.
Top with the remaining cheese.
Bake in preheated oven for 20-25 minutes.
Top with chopped green onions, cilantro, diced jalapeños.
ENJOY!