Spray a 13-by-9-inch baking dish with nonstick spray.
Heat some oil in a large skillet over medium heat.
When the oil is hot, add 2 cups of onion. Cook them until they're see-through, which takes about 2 to 3 minutes.
Add mushrooms, zucchini, and 1⁄2 teaspoon of salt to the skillet. Cook these veggies for 15 to 20 minutes until they're soft. Stir them now and then.
While the vegetables are cooking, make the sauce. In a blender, mix tomatoes, chipotle pepper, garlic, chili powder, cumin, oregano, the rest of the onion, and 1 teaspoon of salt. Blend them until smooth.
Once the vegetables are done, put them in a medium bowl. Add the chicken and 1 cup of the tomato sauce you just made. Mix them together.
Take your baking dish and spread 1⁄2 cup of the tomato sauce on the bottom.
Place 6 tortillas over the sauce. It's okay if they overlap to fit in the dish.
On top of the tortillas, add half of your chicken and veggie mix. Then sprinkle 1⁄2 cup of cheese over it.
Now, layer 6 more tortillas, the rest of the chicken mixture, and another 1⁄2 cup of cheese.
Finish by placing the last 6 tortillas on top. Cover them with the remaining tomato sauce and sprinkle the rest of the cheese over it.
Bake in the oven for 15 to 20 minutes. It should look golden and bubbly when it's done.
Let rest 5 to 10 minutes to let it cool down a bit before serving.
Serve each piece with a tablespoon of sour cream.
Notes
Serving Size: 1/12 of Casserole and 1 tablespoon Sour Cream5 Points (2022/2023 Plan)MyWW Points: 5 Blue Plan and 7 Green Plan5 WW Freestyle Points and 7 Smart PointsWe are not associated with Weight Watchers/WW in any way. Double check points on their official calculator.