Heat your skillet over medium-high heat until shimmering, and add a splash of olive oil—listen for a gentle crackle as it heats.
Slice the chicken breasts into thin strips about 1 cm wide, then season them with salt, pepper, paprika, cumin, and chili powder, tossing to coat evenly.
Add the seasoned chicken to the hot skillet and cook for 4-5 minutes, stirring often, until the strips turn golden brown and are cooked through, releasing a fragrant aroma.
Remove the chicken from the pan and set aside. In the same skillet, add sliced peppers and onions, and cook for about 5-7 minutes, stirring frequently, until they blister and soften with some charred spots.
Return the cooked chicken to the pan, squeeze over fresh lime juice, and toss everything together. Cook for another 2 minutes, allowing the flavors to meld and the mixture to smell smoky and citrusy.
Meanwhile, warm the tortillas in a dry skillet or microwave until soft and pliable, about 20-30 seconds.
Serve the sizzling fajita mixture hot, with tortillas on the side. Let everyone build their own fajitas, wrapping up the flavorful filling into warm tortillas for a messy, delicious bite.