01 -  Preheat oven to 400°F. Grease an 8-inch square baking pan or a 10-inch cast-iron skillet with cooking spray or butter. 
 02 -  In a large mixing bowl, whisk together flour, cornmeal, sugar, baking powder, baking soda, and salt until evenly blended. 
 03 -  In a separate bowl, whisk together milk or buttermilk, eggs, vegetable oil or melted butter, and pickle juice until fully incorporated. 
 04 -  Add wet ingredients to dry ingredients. Stir gently with a spatula until just combined; avoid overmixing. 
 05 -  Carefully fold in shredded cheddar cheese, chopped pickles, jalapeños, and chives or green onions if using. 
 06 -  Pour batter into prepared pan or skillet and smooth the surface with a spatula. 
 07 -  Place in oven and bake for 28 to 32 minutes, or until top is golden and a toothpick inserted in the center returns clean. 
 08 -  Rest for 10 minutes before slicing. Serve warm for optimal flavor and texture.