Set to 400°F (200°C) and grease an 8-inch square pan or line it with parchment.
In a large bowl, whisk together cornmeal, flour, sugar, baking powder, and salt.
In another bowl, whisk sour cream, milk, melted butter, and eggs until smooth.
Pour wet mixture into the dry and stir gently until just combined—don’t overmix.
Pour into the pan, smooth the top, and bake for 20–25 minutes until golden and a toothpick comes out clean.
Let cool in the pan for 10 minutes, then slice and serve warm with butter or honey.