f you are using butter or margarine, take it out from the refrigerator in good time so it will soften.Heat up the oven to 390°F/200°C.
Stir together butter or oil with sugar. Add the eggs and sourdough discard and mix with the batter.
In a separate bowl, combine flour with baking soda and vanilla sugar.Stir in the flour mixture to the batter. I used a hand mixer to get a smooth, even consistency.
Fill 6 large muffin forms (or 8 small) with batter. Don't fill all the way up.
Press down some blueberries into the batter, and sprinkle with flaked almonds.
Bake these sourdough blueberry muffins for 20 minutes. They should have a nice golden brown color.