Preheat oven to 350 degrees F (175 degrees C). Grease a 9×13-inch baking dish with cooking spray.
Cook sausage and onion in a large skillet over medium heat, stirring until sausage is crumbly and no longer pink, about 5 minutes. Drain on paper towels.
Mix cornmeal, flour, salt, and baking soda together in a large bowl.
Whisk buttermilk, oil, and eggs together in a small bowl. Add to the cornmeal mixture, stirring just until moistened. Stir in sausage mixture, black-eyed peas, Cheddar cheese, corn, green chile peppers, and pickled jalapeno peppers. Pour batter into the prepared baking dish.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 1 hour.
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