Preheat oven to 450 degrees. Combine first 5 ingredients in bowl (through eggs) and stir with a whisk. Sprinkle baking powder over batter and whisk until blended. Fold in cornmeal, flour and jalapeno. Spoon into 10 inch cast iron skillet coated with cooking spray. Bake at 450 degrees until lightly browned, about 20 minutes.
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