01 - Preheat oven to 375°F (190°C). Grease a standard loaf pan with butter or non-stick spray.
02 - In a large mixing bowl, whisk together all-purpose flour, baking powder, baking soda, salt, and sugar until evenly distributed.
03 - Pour in buttermilk and melted butter. Mix just until a shaggy dough forms; do not overmix.
04 - Gently fold in shredded cheddar cheese. Transfer the dough into the prepared loaf pan, pressing lightly to distribute evenly.
05 - Brush the surface with melted butter and sprinkle additional cheddar cheese on top. Place in the oven and bake for 20 to 25 minutes, or until the loaf is golden brown and a toothpick inserted in the center comes out clean.
06 - Allow the loaf to cool for 5 minutes in the pan. Loosen edges, then gently remove and serve warm. Slice or pull apart to enjoy.