Heat oven to 400 degrees.
Mix your flour, sugar, salt, baking powder and cream of tartar in a bowl.
Using a pastry blender cut your butter into the flour. Until crumbly with small pieces of butter showing.
Combine your beaten egg and milk in a small bowl.
Add the milk mixture to your flour and stir until dough comes together.
Dump dough on a floured surface and knead about 10 times.
Roll your dough out to 1" thickness.
Using your biscuit cutter, cut your biscuits. Press down and pull straight up. Don't twist the cutter. Stack your dough and cut the rest of the biscuits.
Place on an ungreased cookie sheet. Leave room in between each biscuit.
Bake for 12 to 15 minutes or until puffed and golden brown. Enjoy!