In a bowl combine all ingredients for Steak. Cover and let marinate for at least 30 minutes.
Preheat grill pan to medium-high and then place steak on grill pan. Cook for 6 minutes on each side. Remove from heat and let rest for at least 5 minutes before slicing into 1/4-inch pieces.
Preheat oven to 400 deg.
In a saucepan over medium-high heat, add butter and garlic powder. Once melted whisk in flour and cook for 2 minutes. Next add chicken broth and cook for 3 minutes. Add jalapenos, and lime juice. Then whisk in sour cream until creamy then cook another 2 minutes. Stir in cheese and cilantro and cook until totally melted.
Now it's time to build the enchiladas - start by putting a thin layer of sauces in the bottom of 2 13 x 9 glass dishes. Then place 4-5 slices of steak in the center of a tortilla, ladle roughly a 1/4 cup of sauce over steak then roll up. Place in glass dish, seam down. Repeat with remaining tortillas - should get 8 in each tray. Cover with shredded cheese and cilantro. Put into over for 20 minutes.