Remove the steak from the fridge for 30-45 minutes before grilling.
In a large mixing bowl, mix the corn, sour cream, mayo, chili powder, red onion. Lime, cotija, and a pinch of salt until combined. Taste and adjust salt if needed. Set aside.
Preheat the grill to 450 degrees Fahrenheit and generously season the skirt steak with salt and pepper.
Grill for about 2-4 minutes per side, or until desired doneness is reached. Let rest for about 10 minutes before slicing, then slice the steak against the grain into bite-sized pieces.
Warm the tortillas on the grill then assemble the tacos. Place a generous amount of steak into each tortilla, followed by a generous spoonful of the corn. Garnish with cilantro and more cotija if desired and enjoy!