Step 1: Cook the Quinoa - Rinse the quinoa under cold water. Combine with 1 cup of water in a medium saucepan, bring to a boil, reduce heat, cover, and simmer for about 15 minutes. Fluff and set aside.
Step 2: Prepare the Filling - In a large mixing bowl, combine cooked quinoa, black beans, sweet corn, chopped green onions, cilantro, and cumin. Fold ingredients together until well combined.
Step 3: Mash the Avocados - In a separate bowl, mash the avocados until creamy. Optionally, add salt and lime juice for flavor.
Step 4: Assemble the Enchiladas - Preheat the oven to 350°F (175°C). Spread enchilada sauce in the baking dish, fill tortillas with the quinoa mixture and mashed avocado, roll them up, and place seam-side down in the dish.
Step 5: Top with Sauce - Pour more enchilada sauce over the assembled enchiladas and sprinkle with cilantro or cheese if desired.
Step 6: Bake - Cover with foil and bake for 25 minutes, then uncover and bake for an additional 10 minutes until crispy and golden.
Step 7: Serve and Enjoy - Allow to cool slightly, serve hot with garnishes like cilantro or avocado slices.