Preheat & Prep: Preheat oven to 425°F (220°C). Coat the bottom of a cast iron skillet (or baking pan) with bacon grease.
Cut in Butter: Grate the cold ½ stick of butter directly into the self-rising flour. Toss the flour and butter together so the butter is coated and distributed.
Make Dough: Add the milk and most of the cheddar cheese (reserving a little for the top). Stir just until incorporated—do not overwork the dough.
Drop Biscuits: Scoop the dough and drop it directly into the skillet. Place them close together but not quite touching, allowing a little room to rise.
Top & Bake: Sprinkle the reserved cheese on top of the biscuits. Bake for approximately 12 minutes.
Garlic Butter Glaze: While baking, mix the 2 tbsp melted butter, garlic powder, and parsley in a small bowl.
Serve: Brush the garlic butter mixture over the hot biscuits immediately after taking them out of the oven.