Preheat your oven to 350°F (175°C).

In a large skillet, heat over medium heat, add the ground beef and chopped onion. Cook for 5-7 minutes until the beef is fully cooked and the onion is tender.

Stir in the black beans, diced tomatoes with green chilies, chili powder, cumin, garlic powder, salt, and pepper. Let simmer for about 5 minutes.

In a mixing bowl, combine cornmeal, milk, and the large egg until smooth.

Grease a 9x13-inch baking dish and pour half of the cornmeal mixture into the base.

Layer the beef and bean mixture over the cornmeal base.

Pour the remaining cornmeal mixture over the beef layer and smooth it out.

Sprinkle shredded cheddar cheese and sliced black olives on top.

Bake for 30-35 minutes until the top is golden brown.

Let cool for 10 minutes, then garnish with freshly chopped cilantro before serving.