Sourdough Blueberry Muffin

• 1 egg
• 1 blueberries
• 3/4 sourdough
• 190 gr flour (white)
• 120 ml water
• 120 ml cooking oil
• 100 gr sugar
• 65 gr wheat flour (whole)
• 60 gr dry skim milk powder
• 4 ml soda