Green Chili Chicken Stacked Enchiladas

Ingredients

• 1 tablespoon olive oil
• 1 onion, diced
• 4 cups cooked chicken, shredded
• 1 teaspoon ground cumin
• 1 teaspoon chili powder
• 2 ( 15-ounce) cans green enchilada sauce
• 9–10 tortillas
• 3 cups grated cheddar cheese
• Diced tomatoes, chopped cilantro, and sour cream, for serving