Whisk together flour, chili powder, smoked paprika, garlic powder, cumin, salt, and black pepper in a small bowl. The flour does more than just add bulk; it gives the spices something to grip so they coat the chicken evenly without falling off in the pan.
Slice boneless, skinless chicken breasts into half-inch strips against the grain. Toss the strips in the spice mixture and press the seasoning into the meat with your fingers so every edge gets a thorough coating before it hits the heat.


