Preheat your oven to 375°F (190°C).
In a skillet, heat olive oil over medium heat.
Add diced onions and sauté until translucent.
Mix in shredded chicken, garlic powder, and cumin. Stir for 5 minutes.
Pour half of the enchilada sauce into the bottom of a baking dish.
Warm the tortillas in a microwave for 20 seconds to soften.
Spoon the chicken mixture into each tortilla and roll tightly.
Place the filled tortillas seam-side down in the baking dish.
Pour the remaining enchilada sauce over the top and sprinkle with cheese.
Bake for 20 minutes or until cheese is bubbly and golden.