Preheat your oven to 350°F (175°C).
In a medium bowl, gently combine the shredded chicken, ⅔ cup of the sour cream, the taco seasoning, and 1 cup of the shredded cheese. Mix until well combined.
In a large skillet, soften the cream cheese over medium heat. Stir in the green enchilada sauce, the remaining ⅔ cup of sour cream, and the diced jalapeño. Whisk until the sauce is smooth and warm.
Spread about ½ cup of this creamy sauce evenly into the bottom of a 2-quart baking dish.
Divide the chicken mixture among the low-carb tortillas. Roll each tortilla tightly and place it seam-side down in the prepared baking dish.
Pour the remaining creamy sauce generously over the rolled enchiladas.
Cover the baking dish and bake for 15 minutes.
Uncover, sprinkle the remaining 1 cup of shredded cheese over the top, and bake for another 5-10 minutes, or until the cheese is beautifully melted and bubbly.
Let it cool slightly before serving. Enjoy your delicious and easy low-carb meal!