Preheat the oven to 400°F. Place 1 tablespoon of the butter in an 8x8-inch baking pan and place it in the oven for about 3-5 minutes while the oven preheats. Once the butter is melted, brush it across the bottom and up the sides of the pan. Set aside.

Cut the remaining butter into small pieces. Keep cold until you are ready to use it.

In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt. Add the cold butter pieces; toss in the flour mixture, then use your fingertips to smash the butter into flat, irregular pieces.

Add the blueberries and toss to combine. Gently stir in the buttermilk until no dry pockets of flour remain.

Transfer the dough to the prepared baking pan. Use a spatula to spread the dough evenly across the pan, including into the corners.

Lightly spray a bench scraper with nonstick cooking spray and use it to score the dough into 9 equal squares, but do not separate.

Bake for 40-45 minutes or until the tops of the biscuits are browned and a paring knife inserted into the center biscuit comes out clean. Let the biscuits cool for 5 minutes.

Prepare the honey butter: In a small microwave-safe bowl, combine the butter, honey, and salt. Microwave until the butter is melted, 30-60 seconds, and stir to combine.

After the biscuits have cooled for 5 minutes, turn them out onto a baking sheet, then flip them back onto a wire rack (they should be top-side up again). Brush the tops with all of the honey butter. Cool for an additional 10 minutes before using a serrated knife to cut the biscuits along the scored marks. Serve warm.