Step 1

Preheat the oven to 350°F.

Step 2

In a large skillet, heat the oil over medium heat. Add the garlic, jalapeño, and onion and sauté until softened, about 3 minutes. Stir in the chicken, green chiles, paprika, and a pinch each of salt and pepper. Reserve ½ cup of the enchilada sauce, then pour the remaining sauce into the skillet, stirring to combine. Cook until warmed through, 1 to 2 minutes. Turn off the heat and stir in the sour cream.

Step 3

Spread the reserved 1/2 cup enchilada sauce in the bottom of a 9-by-13-inch baking dish. Line the bottom of the dish with 12 tortilla halves (overlapping as necessary to cover), then spread with one-third of the chicken mixture, and sprinkle with 1 cup of the monterey jack cheese; repeat to make 2 more layers of the tortillas, chicken mixture, and cheese. You should have 3 layers total.

Step 4

Bake until bubbling and golden brown, 30 to 35 minutes. Let rest 10 minutes. Sprinkle generously with chopped cilantro before serving.