Chicken Tacos (I prefer soft but hard is fine too).
Chop chicken breast or thigh into strips, add cumin, paprika, salt, you said spice is welcome so maybe chili flakes to taste. Add a little lemon juice and mix it together.
Put a little oil in a pan (not much, we're not looking to fry it. Spray oil would do). sear the chicken. If you have a barbecue you could cook it on that, or a griddle pan, but a normal one will do.
remove the chicken and add capsicum (peppers) cut into strips, onion, a bit more cumin and paprika and a little water (careful, you only want a splash and you don't want it to spit). When they're soft and cooked, remove from the pan.
Assemble your tacos with the chicken, the onion and capsicum mix, lettuce, tomato if you dig it, cheese if you want.