Preheat the oven to 400 degrees F.
Saute onion in hot oil in a 10-inch cast iron skillet over medium-high heat 3 to 4 minutes or until tender. Stir in beans and next 8 ingredients. Bring to a boil; reduce heat and simmer, uncovered, 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 chicken mixture.
Bake for 20 minutes or until a wooden pick inserted in topping comes out clean. Sprinkle with remaining 1/2 cup cheese and remaining 1/4 cup cilantro. Sprinkle avocado slices with lime juice, and arrange over cobbler. Serve with sour cream.
"The recipes for this program, which were provided by contributors and guests who may not be professional chefs, have not been tested in the Food Network's kitchens. They have been tested in the Southern Living Test Kitchens. All brand names have been removed from these recipes, which originally appeared on southernlivingcookoff.com."
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