Preheat your oven to 400°F. Take a sip of something – you’ve earned it.
Toss the chicken, peppers, and onion with olive oil and all the spices right on the sheet pan. Yes, right there – no need to dirty another bowl.
Spread everything out into a single layer. If it’s crowded, use two pans – no one likes steamed fajitas.
Roast for 20-25 minutes, flipping halfway through. Chicken should be golden and cooked through, veggies lightly charred.
Warm tortillas however you like – microwave, stovetop, or toss them in the oven for a minute.
Build your fajitas: chicken, peppers, a squeeze of lime, and whatever toppings your heart desires.
Eat immediately. Try not to burn your tongue in excitement.