After the 15 minutes have passed, line a small baking sheet with a piece of parchment paper.
Lightly dust your work surface with a bit of flour.
Take the biscuit dough out of the freezer and unwrap it. Lay the dough onto the flour to coat one side, then flip it over so the uncoated side is now on the floured surface. Use a rolling pin and the bench scraper to get the dough as square as possible while maintaining about 1.5" thickness.
Cut the dough into 4 equal squares and place them on the lined baking sheet with about an inch or two of space between them. Cover with plastic wrap and place them back in the freezer for 15 minutes.
If you haven't yet, nows the time to turn your oven to 425 F.
After the 15 minutes have passed, take the tray of biscuits out of the freezer and remove the plastic.
Brush the top of the biscuits with heavy cream and sprinkle with flaky salt. Immediately bake in the hot oven for 20 minutes.
After the 20 minutes have passed, turn the pan 180 degrees and bake for another 5-10 minutes until deeply golden brown.
Remove the pan from the oven and leave to cool for 10 minutes before enjoying!