Adjust rack to top position and preheat oven to 450 degrees.
Pat pork dry with paper towels; season all over with half the Za’atar Spice (all for 4 servings), a big pinch of salt, and pepper.
Heat a drizzle of oil in a large pan over medium heat. Add pork and cook, turning occasionally, until browned all over, 4-8 minutes.
Turn off heat; transfer to a baking sheet. Wipe out pan. Roast on top rack until cooked through, 10-12 minutes. Transfer to a cutting board to rest.
Swap in chicken for pork; cook until browned and cooked through, 3-5 minutes per side. Turn off heat; transfer to a cutting board to rest (no need to roast!). Wipe out pan.