Preheat your oven to 375°F (190°C).
In a skillet, heat olive oil over medium heat.
Add diced onions and sauté until translucent.
Stir in shredded chicken, cumin, salt, and pepper.
Warm tortillas until pliable.
Spread a small amount of enchilada sauce on the bottom of a baking dish.
Fill each tortilla with the chicken mixture and roll tightly.
Place enchiladas seam-side down in the baking dish.
Pour remaining enchilada sauce over the top and sprinkle with cheese.
Bake for 25 minutes or until cheese is bubbly and golden.