Begin by preheating your oven to 450°F (230°C).
In a large mixing bowl, whisk together the flour, baking powder, sugar, salt, and cream of tartar.
Add the cold, cubed butter to the dry mixture and work it into the flour until the mixture resembles coarse crumbs.
Stir in the shredded sharp cheddar cheese and minced garlic until well combined.
Pour in the milk and gently mix until just combined.
Drop spoonfuls of dough onto a baking sheet lined with parchment paper.
Mix melted butter with garlic powder and dried parsley, then brush this mixture over the tops of the biscuits.
Bake for 12-15 minutes or until the biscuits are golden brown on top.
Once baked, remove the biscuits from the oven and let them cool on a wire rack.