Preheat your oven to 120°C (or 100°C for fan ovens/Gas ½). Wrap the tortillas in foil and place them on a baking tray. Let them warm in the oven until you’re ready to use them.
In a bowl, toss the chicken strips with the chopped garlic, cumin, chilli powder, and lime juice. Season with salt and pepper, making sure every piece gets a good coating. Let it sit for about 5 minutes so the flavours can meld.
Heat one tablespoon of olive oil in a frying pan over high heat. Add the chicken strips and cook for around 5 minutes, until the chicken is cooked through and has a nice golden-brown sear with a little crisp on the edges.
Pour in the remaining tablespoon of olive oil. Add the thinly sliced red onion and peppers, and fry for about 5 minutes until they start to soften. Turn up the heat for a minute or two so the vegetables get a slight char along the edges.
Fill your warmed tortillas with the chicken and veggie mixture. Top with any of your favourite extras, like mashed avocado, shredded lettuce, fresh coriander, salsa, sour cream, or grated cheddar and dig in!