3 cups flour
1 Tbsp sugar
4 1/2 tsp baking powder
3/4 tsp cream of tartar
1 tsp salt
3/4 cup milk
1 tsp lemon juice
1 egg, white and yolk seperated
3/4 cup cheddar, cut into 1/4 inch cubes
2 Tbsp fresh rosemary leaves, chopped (or 1 Tbsp dry rosemary)
3/4 cup (1 1/2 sticks) unsalted butter, cold and cut into small cubes
Flaky sea salt, for topping
Necessary Tools
Baking sheets with parchment paper
Pastry cutter (optional)
Biscuit cutter or round cookie cutter, 3-4 inches in diameter
Recipe
Preheat oven to 425°F. Prep two baking sheets with parchment.
In a large bowl, whisk flour, sugar, baking powder, cream of tartar, and salt together. In a smaller bowl, whisk together milk, lemon juice, and egg yolk. In a third bowl, whip the egg whites with a whisk until frothy and light, about 5-8 minutes.
Cut the butter into the flour mixture with a pastry cutter (or just your fingers!) and combine until it is the consistency of a coarse meal. Toss in the cheese cubes and rosemary.
Fold the frothy egg whites into the milk mixture. Create a well in the center of the dry ingredients and add the milk mixture, folding the ingredients together with a fork until just combined. The dough will be shaggy.
Dump the ball of dough onto a floured surface and knead for 8-10 minutes. Form the dough into a flattened disk, one to two inches thick. Cut out biscuits, reform the scraps and cut biscuits out of the rest of the dough until you have none left. Arrange the biscuits on the prepared trays and sprinkle with the coarse salt.
Bake 12-15 minutes, until the tops are just golden.