Preheat the oven to 425 degrees F.
In a bowl, whisk together the olive oil, lime juice, zest, honey, cumin, chili powder, paprika, salt, pepper and garlic.
Place the sweet potatoes on the baking sheet. Drizzle on half the marinade and toss well. Place the peppers and onions on the other side of the sheet and add the rest of the marinade, tossing well.
Roast the vegetables for 15 minutes. Remove the pan from the oven and toss the peppers and onions. Gently flip the sweet potatoes too. Return to the oven and roast for 10 to 15 minutes more.
Remove the pan from the oven and sprinkle everything with cotija cheese. Sprinkle on the cilantro.
To serve the fajitas, spoon the potatoes and vegetables into the tortillas. Top with more cotija and cilantro if desired. Add sour cream if you’d like!