Preheat the oven to 375°F and line a baking sheet with parchment paper.
Combine the flour, sugar, baking powder, baking soda, salt, and lemon zest in a mixing bowl. Add the cold butter and use a pastry cutter or your hands to crumble the mixture until it looks like damp sand with pea sized lumps.
2½ cup All-purpose flour, ⅓ cup Granulated sugar, 2½ teaspoon Baking powder, ½ teaspoon Baking soda, ¾ teaspoon Salt, Lemon zest, 10 tablespoon Cold butter
Stir in the mix ins, if using.
1 cup Chocolate chips
In a separate bowl, combine the sourdough discard with the buttermilk or kefir. Whisk until well combined.
¾ cup sourdough starter, ⅔ cup buttermilk or kefir
Pour the sourdough discard mixture into the flour mixture. Gently fold the mixture until it just starts to come together. It will be dry and crumbly but it will come together in the next step.
Tip the dough out onto the counter and push it together to form a round disk. Use a bench scraper or your hands to fold the dough in half three or four times until it comes together and the crumbs get mixed in. Folding the dough will create layers and make the scones flakier. It will also prevent you from over mixing the dough which can make the scones tough.
Divide the dough in half and shape each portion into a 6 or 7 inch round disk. Slice each disk into 8 triangular wedges and transfer to a baking sheet spacing them 1 to 2 inches apart. Place in the fridge and chill the scones for 20 to 30 minutes.
Brush the tops with cream or butter and sprinkle them with Turbinado sugar.
2 tablespoon Cream, 2 tablespoon Turbinado sugar
Bake for 15 to 22 minutes or until golden brown. Cool for 5 to 10 minutes before serving.
If you want to drizzle the scones with a glaze, whisk the sugar with 2 tablespoons of milk and vanilla extract. Gradually incorporate more milk until you achieve a silky, flowing consistency. The glaze should be smooth enough to easily fall off a spoon yet thick enough to leave a ribbon-like trail when drizzled back into the bowl. Drizzle over the scones and let it dry for 1 to 2 hours.
1 cup Powdered sugar, 2 tablespoon Milk, ½ tablespoon Vanilla extract