To create your amazing Baked Beef Chiles Rellenos Casserole, follow these easy steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Roast Peppers: Roast the poblano peppers over an open flame or in the oven until the skins are charred. Place them in a zip-top bag for 10 minutes, then peel and remove seeds.
3. Cook Beef: In a large skillet over medium heat, cook the ground beef until browned. Drain any excess fat.
4. Add Aromatics: Stir in the diced onion and minced garlic. Cook until the onion is translucent.
5. Spice It Up: Add cumin, chili powder, smoked paprika, salt, and pepper. Stir and cook for 1-2 minutes until fragrant.
6. Mix Filling: In a large bowl, combine the cooked beef mixture, black beans, and 1 cup of shredded cheese. Mix well.
7. Prepare Egg Mixture: In another bowl, whisk together the eggs and milk. Season with a pinch of salt and pepper.
8. Layer Ingredients: In a greased 9×13 inch baking dish, pour half the egg mixture. Layer the roasted peppers, then fill with the beef and bean mixture. Cover with the remaining peppers.
9. Top with Salsa: Spread the salsa or diced tomatoes over the top layer of peppers.
10. Finish with Egg Mixture: Pour the rest of the egg mixture over the casserole, ensuring everything is covered.
11. Bake: Sprinkle the remaining cheese on top. Bake in the preheated oven for 30-40 minutes or until the eggs are set and the top is golden brown.
12. Garnish and Serve: Once out of the oven, let it cool for a few minutes. Garnish with fresh cilantro before slicing and serving.