Preheat your oven to 375 degrees Fahrenheit and lightly grease a 9x13 inch baking dish.
Heat olive oil in a skillet over medium heat. Add the diced onion and cook until soft, about 3 to 4 minutes. Stir in the garlic, cumin, and chili powder and cook for another 30 seconds until fragrant.
Add the shredded chicken to the skillet and season with salt and pepper. Stir to combine everything evenly, then remove from heat.
Spread about half a cup of enchilada sauce across the bottom of the baking dish.
Spoon the chicken mixture into each tortilla, sprinkle with cheese, roll tightly, and place seam side down in the dish.
Pour the remaining enchilada sauce over the top and sprinkle with the rest of the cheese.
Cover loosely with foil and bake for 20 minutes. Remove foil and bake an additional 5 minutes, or until the cheese is melted and bubbly.
Let rest for a few minutes before serving, then add your favorite toppings.