Begin by smashing the cold butter into the flour mixture using your fingertips until well combined.
Gently fold in the fresh blueberries and the chilled buttermilk into the dough until just mixed.
Press the dough into an 8-inch square baking pan, ensuring it is evenly distributed.
Score the dough into 8 squares to make it easier to separate after baking.
Bake in a preheated oven at 400 degrees Fahrenheit until the biscuits are golden brown, which should take about 40 to 45 minutes.
Once baked, brush the tops with the salted honey butter before serving.
