We love the trend of “sheet pan suppers” in which all of the components roast together on a single sheet pan. Using a marinade for the chicken and the oven to cook fajita fillings means you’ll build flavor without a lot of hands-on work.
Make cilantro-lime vinaigrette - Chop garlic and cilantro. Combine with brown sugar, cumin (the portion for the vinaigrette), lime juice and oil (the portion for the vinaigrette). (Can be done up to 4 days ahead)
Marinate chicken - Slice chicken into strips. Combine chicken with half the vinaigrette (reserve the other half). Marinate for 20 minutes.
Bell peppers / Onions - Prep as directed and combine. (Can be done up to 5 days ahead)
Make spice mix - Combine paprika, coriander, salt, cumin (the portion for the fajitas) and black pepper. (Can be done up to 5 days ahead)
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Toss bell peppers and onions with oil (the portion for the fajitas). Spread out onto a sheet pan. Transfer to the oven and roast until peppers are starting to turn tender, 15 minutes.
Remove peppers and onions from the oven and give them a good stir. Top with chicken strips and pour the vinaigrette (just the portion in which the chicken was marinating) over top. Season the entire dish with spice mix and return the pan to the oven.
Bake until chicken is cooked through, 12 to 16 minutes.
Meanwhile, slice shallots and segment oranges. Combine with spinach. Just before serving, toss with reserved half of vinaigrette until salad is dressed to your liking.
When chicken is nearly finished, warm tortillas according to package directions.
To assemble fajitas, fill tortillas with chicken, peppers and onions. Top with a spoonful of sour cream. Enjoy with salad on the side.