Preheat oven to 450 F (232 C) and line baking sheet with parchment paper.
Hand whisk together flour, sugar, baking powder, and salt.
Add pieces of cold butter and mix together by hand. Work the butter into the flour by squeezing it with your fingers. Mixture should begin to thicken as butter is incorporated. It should begin to look and feel like cornmeal with tiny chunks of butter.
Stir in your cheddar cheese and rosemary.
Then, pour in your buttermilk.
Stir with wooden spoon until a dough is formed. Should be slightly moist and sticky, but still hold its shape.
Using a large spoon or ice cream scoop and make 6 biscuit dough balls. Place balls on parchment paper or silicone lines baking tray 2-3 inches apart..
The dough should be divided evenly into six scoops. This should yield 6 large biscuits.
No need to flatten, you can simply shape a little with your fingers to make it round. But, remember its not supposed to look perfect.
Place tray in the fridge to chill the dough for 8-10 minutes before baking. This simply helps firm the butter and maintains a more rounded shape to the biscuits while baking.
Bake until edges are golden brown, about 14-16 minutes.
Serve warm right out of the oven!