Place chicken, sliced onion, lemon juice and garlic in a large zip top bag. In a bowl mix together cumin, paprika, coriander, salt, turmeric, pepper and pepper flakes (if using) with a spoon until well combined. Add to the zip top bag, seal, then massage to combine. Set aside for 2-24 hours as a meal prep or use immediately.
Heat oil in a large skillet over medium high heat. Once the oil is hot, add the chicken and cook for 4 minutes, undisturbed. Flip the chicken and cook an additional 3-4 minutes per side, until internal temperature reaches 165° F. See photos above for a visual, if desired. Serve and enjoy!
Notes
Chicken thighs are more traditional, but breasts work fine in a pinch. If using chicken breasts instead of chicken thighs, make sure to slice them thin.
Do not over cook the chicken or it will be tough and chewy instead of soft and tender.
The marinade is so flavorful that letting the chicken soak in it is not necessary for this recipe! However, if you do decide to marinade it, the flavors will be even stronger.
You can make this as meal prep too! Make the marinade up to days in advance, or just throw it in the freezer. I like to make a double batch in 2 bags and place one in the freezer to use later.