Cornbread with greens

1/3 cup butter 2 eggs 1 1/2 cups flour 1 cup cornmeal 3 teaspoons baking powder 1 1/2 teaspoons salt 1 1/2 teaspoons chili powder 1/2 teaspoon cayenne pepper[...]

2 tablespoons olive oil 1 cup chopped andouille sausage 1 small yellow onion , chopped 1/2 cup chopped green onion 4 tablespoons chopped celery 4 tablespoons[...]