Preheat your oven to 425°F (220°C).
In a mixing bowl, combine flour, baking powder, and salt. Mix well.
Cut in the chilled butter until mixture resembles coarse crumbs.
Pour in the buttermilk and stir until just combined; do not overmix.
Turn the dough out onto a lightly floured surface and gently knead 2-3 times to bring it together.
Roll or pat the dough to about 1-inch thickness and cut into biscuits.
Place the biscuits on a baking sheet lined with parchment paper.
Bake for 12-15 minutes or until golden brown.
While baking, prepare the au jus by simmering beef broth, Worcestershire sauce, garlic powder, and black pepper in a saucepan.
Once the biscuits are ready, remove them from the oven, and let them cool slightly before serving.