1. Preheat oven to 350°F.
2. Sauté the diced onion and jalapeño over medium heat until onions are translucent (approximately 3 minutes). Add the ground turkey and season with salt and pepper to taste.
3. Mix in the enchilada sauce and transfer the mixture into a baking dish. Top with an even layer of Mexican cheese.
4. Bake for 10 minutes until the cheese is melted. Then, broil for 2-3 minutes until the cheese bubbles (watch carefully while broiling, as the cheese will burn easily).
5. Serve immediately with iceberg lettuce, pickled jalapeño, lime wedges, and sour cream.
