Add the olive oil to a large sauté pan set over medium-high heat then add the onions and garlic and cook, stirring frequently, until the onions are translucent, about 5 minutes.
Add the oregano, cumin, chili powder and chopped rotisserie chicken and stir until combined.
Add 1/2 cup of the prepared sauce to the chicken filling and stir until combined then remove the pan from the heat.
Ladle 1/2 cup of the prepared enchilada sauce into the bottom of a 9x13-inch baking dish.
One by one, dip the tortillas into the prepared enchilada sauce then arrange them on a cutting board. Divide the chicken mixture among the coated tortillas, spooning it into the bottom third of each tortilla. Carefully roll up each tortilla then place it seam side down in the baking dish atop the sauce, arranging the enchiladas side by side in a single layer.
Pour the remaining sauce atop the enchiladas then top them with the shredded cheese.
Bake the enchiladas for 10 to 15 minutes, until the cheese is melted, then top them with your choice of toppings, such as avocado, sour cream or olives.
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