Preheat your oven to 400 degrees F (200 degrees C). Grease an 8x8-inch baking pan with butter or cooking spray.
In a large bowl, whisk together the cornmeal, flour, baking powder, salt, ranch seasoning mix, and sugar until well combined.
In a separate bowl, whisk together the egg, buttermilk, and melted butter.
Pour the wet ingredients into the dry ingredients and stir until just combined. Do not overmix — a few lumps are fine. Fold in the chopped chives, dill, and parsley.
Pour the batter into the prepared baking pan and spread it evenly. Bake for 22-25 minutes until the top is golden and a toothpick inserted in the center comes out clean.
Let cool in the pan for 5 minutes before slicing into 9 squares. Serve warm with butter.
Notes
Do not overmix the batter or the cornbread will be tough. A few lumps are perfectly fine. For extra ranch flavor, brush the top with melted butter and sprinkle with additional ranch seasoning as soon as it comes out of the oven.