In a plastic bag mix 2 tbsp of the oil, the garlic and all the spices to a marinade (note 1)
Put the chicken breasts into the bag and move a bot around so the marinade spreads evenly over the chicken. Let rest in the fridge until the other preparations are done
Cut your onions and the bell peppers in stripes
Heat up the left tablespoon of oil over medium to high heat in a pan.
Add the onions and bell peppers and let cook for 7-10 minutes until they reach prefered softness and are a bit brown. Stir occasionally so they won´t burn
Take the vegetables out of the pan and add the chicken
Fry the chicken for 5-7 minutes on each side until golden brown and cooked through but not dry (note 2)
Remove and let rest for 5 minutes (note 3)
Put the vegetables back in the pan and heat up a bit again.
Cut the chicken into stripes, add back into the pan with the vegetables and stir. Add salt, pepper and lime juice to taste and serve with tacos or over rice
Note 1: It's easier if you pull it over a bowl and roll down the rims of the plastic bag. This trick will give the bag more stability. You can also do this when you want to fill leftovers into freezing bags.Note 2: To know if the chicken is cooked through push a bit on the thickest part. If it doesn't give in much, it's cooked. It should feel similar to when you push your thumb against your pinkyNote 3: Letting it rest a bit helps to set the juices. So if you cut it open after a bit of rest it won't lose as many juices anymore.