Skillet Cookery: Mexican CornBread

1 cup frozen corn kernels (or 1 16 oz. can cream-style corn & don’t add the milk, or add sparingly) 1 small onion, chopped 2 eggs, beaten 1/3 cup melted shortening + (2 Tbls. for the skillet) 2 tsp. baking powder 1 tsp. baking soda 3/4 tsp. salt 1 Tbls....