Mix cornmeal, flour, baking powder, salt, and sugar in a bowl.
1 cup cornmeal, 1 cup flour, 1 tablespoon baking powder, ¾ teaspoon salt, 3 tablespoons sugar
In a separate bowl, whisk the egg. Then mix in the milk, and finally add the melted butter.
⅓ cup butter, 1 egg, 1 cup milk
Mix liquid mixture into dry mixture. Stir until combined.
Pour batter into a greased 8x8 inch baking dish.
Bake in a preheated 400°F oven for 18-25 minutes.
Let cool slightly, serve while still warm.
Notes
Mix just until combined. Overmixing can make the cornbread dense instead of tender.
Preheat the oven fully. A hot oven helps the cornbread rise and bake evenly.
Check for doneness early. The top should be lightly golden, and a toothpick inserted in the center should come out mostly clean. If needed, bake for a few more minutes.
Let it cool slightly before slicing. This helps the cornbread set and keeps it from crumbling.
If doubling, use a larger pan. Use a 9 x 13 baking dish and increase baking time by 5-10 minutes.