Heat oven to 350 degrees
In a large sauce pan over medium heat add a tsp of olive oil. Add onions, garlic and jalapeno, cook until translucent. Stir often.
Combine chicken to onion mixture and stir to combine
Pour ½ c enchilada sauce over chicken and onion mixture, add sour cream and cilantro. Stir to combine.
Turn off the heat and add 2 c. of the shredded cheese.
Spray a 9 X 13 baking dish with non-stick spray, pour just enough enchilada sauce to cover the bottom.
To fill tortillas put 1-2 tablespoons of sauce on the tortilla and add ¼-1/2 cups of the chicken mixture.
Roll tortillas and place in the baking dish. Repeat until chicken mixture is used up.
Pour remaining sauce over the enchiladas and spread evenly.
Top with remaining cheese and cover with foil sprayed with non-stick spray so the cheese doesn't stick.
Bake 20 minutes, remove foil and bake another 10-15 minutes until cheese is bubbly and melted.
Garnish with more cilantro.