All you need is your discard (or an active sourdough starter), 6 simple ingredients you probably have in your pantry, and some fresh or frozen blueberries.
Simply mix your dry ingredients in a medium bowl. Make sure to mix them a little, so the baking powder gets evenly distributed.
In a large bowl, mix your wet ingredients; sourdough discard, egg, sugar, olive oil, and vanilla extract if you choose to use it.
Slowly add your flour mixture (dry ingredients) to your wet ingredients.
Finally, gently fold in your blueberries. Doing this with a silicone spatula tends to be the most gentle way to fold them in.