Pat the skirt steak dry with a paper towel and season both sides with salt and pepper. Let it sit at room temperature for 15 minutes.
Blend or chop together fresh cilantro, garlic, lime juice, olive oil, red pepper flakes, and a pinch of salt to make the chimichurri sauce.
Heat a cast-iron skillet over high heat for 5 minutes. Add oil and then the seasoned skirt steak. Cook for 2-3 minutes per side until desired doneness.
Remove the steak from the skillet and let it rest on a cutting board for 5-10 minutes.
Slice the skirt steak thinly against the grain and assemble the bowls with cooked rice, steak, and chimichurri sauce.
Garnish with quick-pickled red onions, fresh cilantro, and lime wedges as desired.