Saute onion in hot oil in a 10 inch cast iron skillet over medium heat for 3 to 4 minutes or until tender. Stir in beans and next 8 ingredients. Bring to a boil; reduce heat and simmer uncovered for 15 minutes.
Combine baking mix, egg and milk in a medium bowl, stirring until smooth. Fold in 1/2 cup cheese and 1/4 cup cilantro; pour over simmering checken mixture.
Bake at 400 degrees for 20 minutes or until a wooden pick inserted in topping comes out clean. Sprinkle with remaining 1/2 cup cilantro.