In a large bowl combine eggs, butter, sugar, water, sour cream, and lemon zest. Whisk to combine.
In a smaller bowl combine flour, baking powder, and salt. Whisk to combine.
Add dry ingredients to wet ingredients, in thirds, mixing gently to combine. Fold in blueberries, mix to combine.
Pour batter into a Bundt pan that has been sprayed with baking spray. Brush it in.
Bake at 350F for 45 mins until golden brown and a toothpick or fork comes out clean.
Allow to cool completely for 30 minutes. Reverse cake onto a cooling rack.
Dust it with powder sugar for garnish.