Gather all ingredients.
Preheat the oven to 450 degrees F (230 degrees C).
Place butter in a glass or ceramic 8-inch square baking dish. Microwave for 1 minute. Stir butter; continue to cook and stir in 20-second intervals until butter is fully melted.
Sift flour, baking powder, sugar, and salt into a bowl.
Stir in buttermilk until combined.
Pour into the baking dish and spread over melted butter. Use a bench scraper to cut dough into 9 equal pieces.
Bake in the preheated oven until starting to brown on top, 20 to 25 minutes.
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