In the bowl of the stand mixer, whisk together the dry ingredients. Cut in the butter until you have small crumbles. Mix in 3 eggs and the milk just until the dough comes together. Do not over mix.
Transfer dough to a floured surface. Roll out, dusting with flour as needed, in a rectangle shape. It should be about ½ inch thick. Fold in the sides and roll out again. repeat one more time.
Using a 2 or 2 ½ inch biscuit cutter, cut out your biscuits and transfer them to a greased baking sheet. Using a clean empty soda bottle, gently press the tops of biscuits to make the mark in the center.
Whisk the last egg with a little water and brush on top of biscuits. Bake in a preheated 400 degree oven for 15-18 minutes. I like to turn the broiler on at the end just to brown the tops a little more.
