In a large mixing bowl, combine flour, sugar, baking powder, cinnamon and salt. Whisk together until incorporated. If not using a kitchen scale, be sure to fluff the flour and spoon it into your measuring cups and level off with a knife. This will give you a more accurate measurement.
250 grams all-purpose flour,100 grams sugar,10 grams baking powder,2 grams cinnamon,3 grams salt
Grate the cold/frozen butter and add to the flour mixture. Cut in with a pastry cutter or mix with your fingers until the small pieces of butter are coated with flour and create pea-sized coarse crumbs.
113 grams unsalted butter, frozen
Next, sprinkle in your blueberries and mix until incorporated.
200 grams blueberries
In a medium bowl, whisk together the heavy cream, egg, vanilla extract and sourdough discard until smooth.
You can use active sourdough starter, just be sure to use the same amount in grams. Using cold starter works best because it helps keep the butter from melting too early.
45 grams heavy cream, cold,1 egg, cold,8 grams vanilla extract,120 grams sourdough discard, cold
Pour the wet ingredients evenly on top of the butter mixture. Mix the scone dough with a rubber spatula until the cream mixture is combined. The dough will be crumbly with some bites of dry flour. Be careful not to over mix the dough, the flour will be incorporated in the next step.
Turn out the mixture onto a lightly floured surface and pat into a rectangle. Then, with a bench scraper, fold the dough in half, then press down to create the large rectangle again. Repeat this 3-4 times. Folding the dough helps to create all of those beautiful flaky layers!
With your hands, form the dough into an 8″ disc. Cut the soft dough into 8 equal wedges with a bench scraper or a large knife. Be careful not to slide the bench scraper when cutting the scones! This will close off the dough, which prevents the scones from getting the flaky layers. Simply press straight and pull straight up.
Place the unbaked scones on a baking sheet lined with parchment paper. Cover with a plastic lid and chill them in the fridge for at least 15 minutes while the oven preheats. This plastic lid fits perfectly over my baking sheets!