Prepare the Baking Pan: Preheat the oven to 400°F (200°C). Grease an 8-inch square baking pan with butter or nonstick cooking spray. You can also line it with parchment paper for easier removal.
Combine the Dry Ingredients: In a large mixing bowl, whisk together the cornmeal, all-purpose flour, sugar, baking powder, baking soda, and salt. Make sure the baking powder and baking soda are evenly distributed.
Mix the Wet Ingredients: In a separate bowl, whisk the buttermilk and eggs until smooth. Slowly add the melted butter while whisking to combine.
Make the Batter: Pour the wet ingredients into the dry mixture. Stir gently with a spatula until just combined. A few small lumps are fine, so avoid overmixing.
Transfer to the Pan: Pour the batter into the prepared baking pan. Spread it evenly with a spatula, making sure the corners are filled.
Bake the Cornbread: Place the pan in the preheated oven and bake for 20–25 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean.
Cool Slightly: Remove the pan from the oven and let the cornbread rest for 10 minutes. This allows the crumb to settle and makes it easier to cut into neat squares.
Slice and Serve: Cut the cornbread into nine squares and serve warm with butter, honey, or your favorite savory dish.