Cream: In a bowl, thoroughly mix the butter, vanilla extract, and sugar until fluffed up. This is crucial for creating a light, airy texture in the cookies.
Add the Rest: First, blend in the egg to ensure smoothness in your mixture. Follow by adding the sourdough discard, then sift in the flour and baking powder.
Shape the Cookies: Using a tablespoon, scoop out approximately ¾ tablespoon of batter and place it on a baking mat. Ensure ample space between each dollop on your parchment-lined tray.