Season the flank steaks on all sides with the Salt Pepper + Chocolate Chiles seasoning on all sides. Set aside for at least 30 minutes while you prepare the cheese sauce and the grill.
Melt the butter in a large skillet. Add the flour and whisk to combine. Cook until the flour smells like pancakes. Add in the PBR and whisk to avoid lumps. Bring the mixture to a simmer, adding salt, pepper, garlic, and onion powder as it cooks. Once the sauce base has come to a rapid simmer and thickened, turn off the heat. Add the cheese, paprika, and chipotles. You can use an immersion blender to make this sauce super smooth if desired. Then move the sauce to a thermos to keep warm.
Heat a grill for high direct heat. Grill the flank steak over direct heat for 5 to 6 minutes per side. Remove from the heat and rest for 10 minutes before slicing into bite sized pieces against the grain.
Build the nachos by spreading the tortilla chips out into a single layer on a plate. Pour on the cheese sauce and top the nachos with the flank steak, green onions, and pico de gallo.
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