Preheat the oven to 350 degrees F (175 degrees C). Spray a 9×13-inch baking dish with cooking spray.
Mix sour cream and salsa together in a bowl.
Heat oil in a skillet over medium-high heat. Saute onion and garlic in the hot oil until soft, 5 to 7 minutes. Stir in cooked chicken, 1 cup of the sour cream mixture, 1/2 of the Mexican cheese, and chile peppers.
Spoon about 1/3 cup of the mixture down the center of each tortilla. Roll tortillas and place, seam sides-down, into the prepared dish. Top with remaining sour cream mixture and cheese. Cover with foil.
Bake in the preheated oven until heated through and bubbly, 30 to 40 minutes.
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