240g Sourdough Starter at 100%, it doesn't have to be fresh, discard is fine but keep it in the fridge until you need it.
120g Plain Flour,
0.75 tsp Salt,
2 tsp Baking Powder,
115g Cold Butter, cut into pieces. (I used to grate frozen butter into the mixture but as long as it is cold it works fine.)
Either leave plain or add a maximum of 100g Dried Fruit/Grated Cheese/ Chocolate Chips before mixing.