Heat butter in a sauce pan over medium heat, then add flour.
Add broth, garlic powder, cumin, chili powder and whisk until smooth.
Heat over medium heat until thick and bubbly.
Stir in diced green chiles, jalapeno, and sour cream. Do not bring your sauce to a boil, you don't want curdled sour cream.
Continue to whisk until you have a creamy sauce.
Pour sauce over enchiladas then top with remaining shredded cheese.
Bake for approximately 15 to 18 minutes (or until cheese is melted).
To get that nice sizzle on top: turn your oven on broil and bake enchiladas for three additional minutes to brown your cheese.
Serve and enjoy with a side of rice, lettuce and tomatoes.