Tender Cheddar Garlic Biscuits

Preheat oven to 450 degrees F (230 degrees C).

Mix flour, baking powder, cream of tartar, sugar, and salt together in a bowl; cut in butter using a pastry blender or 2 knives until mixture resembles coarse crumbs. Stir Cheddar cheese into flour mixture; add 1/3 plus 2 tablespoons milk, mayonnaise, parsley, and garlic powder and mix until a soft dough forms.

Transfer dough to a lightly floured surface and knead until smooth, 8 to 10 times. Pat dough into a 6-inch square and cut into 9 smaller squares. Arrange squares 2-inches apart on a baking sheet.

Bake in the preheated oven until golden brown, 10 to 12 minutes.