Preheat the oven to 450F and line a baking sheet with parchment paper.
In a large bowl, combine flour, baking powder, baking soda, salt, pepper, thyme and rosemary.
Use your fingers to work the butter into the dry ingredients until it resembles coarse crumbs. Add skyr and scallion and keep working the dough until it comes together.
Pat the dough or use a rolling pin to form a 1-inch thick rectangle. Cut out 4 rounds using a 3-inch cookie cutter, gather the dough again and cut out two more biscuits. Place biscuits onto the prepared baking sheet and brush each one with milk or lightly whisked egg.
Bake for about 15 minutes, or until golden brown and fragrant.
Serve immediately with your favorite breakfast toppings such as a tomato slice, a fried egg and crispy bacon.