Preheat oven to 375°F (190°C).
In a large skillet, heat the olive oil over medium-high heat. Add the diced onion and cook until translucent, about 3-4 minutes.
Add the minced garlic and cook for an additional minute.
Add the chicken to the skillet and cook until browned and cooked through, about 5-6 minute.
In a large bowl, combine the cooked chicken, shredded cheese, chopped cilantro, and chopped scallions.
In a separate bowl, mix together the diced green chilies and a splash of water.
To assemble the enchiladas, lay a tortilla flat and spoon some of the chicken mixture onto the center of the tortilla. Roll the tortilla up and place seam-side down in a baking dish. Repeat with the remaining tortillas and chicken mixture.
Pour the green chili mixture over the top of the enchiladas and cover with aluminum foil.
Bake for 20-25 minutes, or until the cheese is melted and bubbly.
Remove the foil and bake for an additional 5-10 minutes, or until the top is lightly browned.
Serve hot and enjoy!