Sift 2.5 cups einkorn flour and 1 scant tablespoon baking powder into a large bowl.
Add 1 tablespoon sugar and 1/2 teaspoon salt, whisk to combine.
Add 5 tablespoons of cubed butter; cut butter and flour with a pastry cutter or 2 knives until the mixture resembles rough crumbs.
Add milk, and mix with a spoon until sloppy shaggy dough comes together.
Transfer the dough onto a well-floured surface.
Mold the dough into a ball.
Roll it out (or press with your hands) to about 1 inch tall. Fold in half.
Roll out, and fold again.
Roll the dough to about 8x10".
Cut into biscuits using a biscuit cutter or a glass (don't twist cutter during cutting, it pinches the edges, which affects the rise).
Place einkorn biscuits on parchment lined cookie sheet.
Bake for 12-15 minutes, until the tops just start turning golden.
Notes
I don't use food processor to cut the dough for two reasons. One - it's so bulky to wash, and it's very easy to overprocess it. If you don't have a pastry cutter, use two knives.