1-Prepare Sauce: If making homemade enchilada sauce, prepare it according to recipe instructions and let it simmer while prepping other ingredients. If using store-bought sauce, simply set it aside. This step ensures your zucchini enchilada casserole will have the authentic Mexican flavor foundation that makes it so delicious.

2-Sauté Vegetables: Heat olive oil in a large skillet or pan over medium-high heat. Add diced onion, bell pepper, and jalapeño. Sauté for 6-7 minutes until softened. Add minced garlic and sauté for 1-2 minutes until fragrant. Turn off the heat. This process builds a flavorful base for your zucchini enchilada casserole, bringing out the natural sweetness of the vegetables.

3-Combine Filling: Add the cooked rice (or quinoa/farro), cooked chicken, beans, corn, and 1.5 cups (360ml) of the enchilada sauce to the pan with the sautéed vegetables. Toss everything together until well combined. This creates the hearty filling that will sit between the layers of zucchini in your casserole.

4-Preheat & Prep Dish: Preheat oven to 350°F (175°C). Lightly coat a 9×13-inch baking dish with cooking spray. Spread 1/4 cup (60ml) of the enchilada sauce evenly over the bottom of the dish. This prevents the zucchini from sticking and adds extra flavor to the bottom layer of your zucchini enchilada casserole.

5-Layer Casserole: This step is crucial for the perfect structure of your zucchini enchilada casserole:

• First Layer: Arrange the sliced zucchini in a single, overlapping layer to completely cover the bottom of the dish.
• Second Layer: Spread half of the chicken filling mixture evenly over the zucchini. Sprinkle with 1 cup (approx. 115g) of the shredded cheese.
• Third Layer: Repeat with another overlapping layer of zucchini slices.
• Fourth Layer: Spread the remaining half of the chicken filling mixture evenly over the zucchini. Sprinkle with another 1 cup (approx. 115g) of the shredded cheese.
• Fifth Layer: Add a final top layer of zucchini slices. Drizzle the remaining 1/4 cup (60ml) of enchilada sauce over the top zucchini layer.

6-Bake (Initial): Place the dish in the preheated oven and bake uncovered for 20 minutes. This initial baking time allows the flavors to meld and the zucchini to soften slightly.

7-Add Cheese & Bake Further: Remove the dish from the oven. Sprinkle the remaining 1 cup (approx. 115g) of shredded cheese evenly over the top. Return to the oven and bake for an additional 10 minutes, or until the cheese is melted and bubbly. This final step creates the irresistible golden topping that makes your zucchini enchilada casserole visually appealing and delicious.

8-Rest & Serve: Carefully transfer the hot baking dish to a wire rack. Let it rest for 5-10 minutes before slicing and serving. Add desired toppings generously. This resting period helps the zucchini enchilada casserole set, making it easier to cut into portions and ensuring that all the delicious flavors have time to meld together perfectly.