Step 1: Prepare Your Baking Dish

1. Preheat your oven to 400°F (200°C).
2. Grease a 9×9-inch baking dish or an 8-inch cast-iron skillet with melted butter to ensure the cornbread doesn’t stick.

Step 2: Mix the Dry Ingredients

1. In a large mixing bowl, combine cornmeal, flour, sugar, baking powder, baking soda, salt, and ground black pepper. Whisk thoroughly to ensure all the ingredients are evenly distributed.

Step 3: Combine the Wet Ingredients

1. In a separate bowl, whisk together buttermilk, eggs, and melted butter until smooth and well-blended.
2. Pour the wet ingredients into the dry ingredients and gently mix until just combined. Be careful not to overmix, as this can make the cornbread dense.

Step 4: Add Flavorful Mix-ins

1. Fold in the shredded sharp cheddar cheese, diced fresh jalapeños, and sweet corn. Mix gently until the ingredients are evenly distributed throughout the batter.

Step 5: Transfer to the Baking Dish

1. Pour the batter into the prepared baking dish or skillet, spreading it out evenly with a spatula.
2. Top the batter with pickled jalapeño slices for an extra spicy kick and an attractive presentation.

Step 6: Bake

1. Place the baking dish in the oven and bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean and the top is golden brown.
2. Once baked, remove from the oven and let the cornbread cool in the dish for about 10 minutes before serving.