Preheat Oven:
Preheat oven to 400°F (200°C). Grease a 12-cup muffin tin or line with paper liners.
Mix Dry Ingredients:
In a large bowl, whisk together cornmeal, flour, sugar, baking powder, baking soda, and salt.
Combine Wet Ingredients:
In another bowl, whisk together buttermilk, melted butter, and eggs until smooth.
Mix Batter:
Pour wet ingredients into dry ingredients and gently stir until just combined. Do not overmix.
Fill Muffin Cups:
Divide batter evenly among prepared muffin cups, filling about 2/3 full.
Bake:
Bake for 15–20 minutes, or until a toothpick inserted in the center comes out clean and tops are golden brown.
Cool and Serve:
Let muffins cool in the pan for 5 minutes, then transfer to a wire rack to cool slightly before serving.