Preheat oven to 400°F. Line a baking sheet with parchment paper.
Blend flour, 3 Tbsp. sugar, baking powder and salt in a large bowl. Grate cold butter into the dry ingredients; cutting in with pastry blender until it resembles fine crumbs. Combine egg (or applesauce) with 5 Tbsp. cold milk; slowly pour into flour/butter crumbles, mixing gently with a fork to combine. If needed, use 1 additional Tbsp. of milk to bring the dough together. On a floured surface, gently pat dough into a circle about 1/2-inch thick. Brush top with remaining Tbsp. of milk and sprinkle with remaining 1 Tbsp. sugar. Cut into 8 wedges and bake in preheated oven 10-12 minutes. Take care not to overbake; tops should be light in color and set; bottoms should be golden brown. Overbaking will result in dry scones.
VARIATIONS: Add spices such as cinnamon, nutmeg, clove, allspice, ginger, etc. into the dry ingredients. How much you use depends on your taste, usually between 1/2 tsp. and 1 tsp.
Mix-ins such as 1 cup fully frozen blueberries, cherries, raspberries; mini-chocolate chips; chopped nuts or toasted coconut may be added to the flour/butter crumbles before mixing in liquid. Zest orange or lemon rind into liquid before adding to flour/butter mixture.
Or add extracts such as vanilla, almond or mint to liquid ingredients before mixing dough together. This is fun recipe to be creative with; you may want to make them every day! They may even be made savory with herbs such as basil, rosemary, or thyme.