Set your oven to 375°F (190°C), and generously grease an 8×8-inch or 9×9-inch baking dish using nonstick spray.
In a sizable mixing bowl, blend together the flour, cornmeal, baking powder, baking soda, and salt. Mix thoroughly, then set aside.
In a separate bowl, whisk the melted butter with the sugar, honey, and egg until smooth. Incorporate the buttermilk and mix until uniform.
Combine the wet mixture with the dry ingredients, stirring just until a cohesive batter forms—avoid overmixing.
Transfer the batter into your prepared pan, smoothing the surface evenly with a spatula.
Bake in the preheated oven for 18 to 22 minutes, or until a toothpick inserted into the center emerges clean.
While the cornbread is baking, place the honey and butter for the glaze in a small microwave-safe bowl. Warm briefly in the microwave until the butter has fully melted.
Stir the glaze until smooth, then gently brush it over the surface of the cornbread once it comes out of the oven and is still warm.
Cut into squares and serve while warm.