Preheat your oven to 350°F (175°C).
In a mixing bowl, combine the shredded chicken, diced onions, cumin, salt, and pepper.
Warm the corn tortillas in a skillet or microwave to make them pliable.
Spread a little enchilada sauce on the bottom of a baking dish.
Place a few tablespoons of the chicken mixture in the center of each tortilla.
Roll up the tortillas and place them seam-side down in the baking dish.
Pour the remaining enchilada sauce over the rolled tortillas.
Sprinkle shredded cheese on top of the sauce.
Bake in the preheated oven for 20-25 minutes, until cheese is melted and bubbly.
Garnish with chopped cilantro and serve with sour cream and avocado slices.