Bean and cornbread casserole

Ingredients:

1 teaspoon olive oil
1 cup chopped onion
1 garlic clove, minced or put through a press
1 teaspoon chili powder
1-1/2 teaspoon ground cumin
1 teaspoon sugar
1/2 teaspoon dried oregano (preferably mexican oregano)
2 8-ounce cans tomato sauce
2/3 cup cooked pinto beans, drained
2/3 cup cooked black beans, drained
1 4.5-ounce can chopped green chiles, drained
3/4 cup buttermilk
1 egg, lightly beaten
1 cup cream-style corn
1-1/3 cup self-rising yellow cornmeal mix (not cornbread mix)

Preparation:

Preheat oven to 400 F.
Saute the onion and garlic in the olive oil in a large saucepan over medium heat.
Add the chili powder, cumin, sugar, oregano, tomato sauce, pinto beans, black beans and chiles.
Cover, reduce heat to medium-low and simmer for 10 minutes.
Spray a 2-quart casserole dish with cooking spray.
Pour the bean mixture into the dish, cover and set aside.
In a medium bowl, combine the buttermilk, egg and corn, stirring well.
Add the self-rising cornmeal and stir, just to combine.
Pour the cornmeal mixture over the bean mixture in an even layer.
Bake for 20 to 25 minutes, or until the cornbread topping is lightly browned. Serve hot.