Preheat your oven to 450°F (230°C).
In a medium mixing bowl, whisk together flour, baking powder, sugar, and salt.
Add in the buttermilk and stir until just combined. Don’t overmix—lumpy is lovely here.
Pour the melted butter into an 8-inch square baking dish. Yes, all of it. Trust the process.
Spoon the biscuit dough right over the butter and gently spread it out.
Score the dough into 9 squares using a butter knife. This helps them bake evenly.
Bake for 20-25 minutes, or until the top is golden brown and your kitchen smells like heaven.
Let them cool just long enough so you don’t burn your mouth, then dig in.