Spray a nonstick pan with nonstick cooking spray. Heat the olive oil in the pan. Add the onion and garlic; sauté until translucent. Add the chicken stock, 2 1/2 cups of the cooked black beans and the creole seasoning. Bring the mixture to a gentle boil and cook until the amount is reduced by a third; puree in a blender or food processor until smooth. (you may refrigerate this nor for serving later. Then reheat the bean puree; if necessary, thin the puree with additional chicken stock to make it smooth.) When serving, place 1/3 cup of the cooked brown rice in each bowl. Top with 1/4 cup of the reserved whole black beans (heated). Add 1 cup heated bean puree. Squeeze 1/2 lime over each bowl. Garnish with a cilantro leaf, if desired. Makes 6 servings- 261 calories