Prepare the Lemon-Blueberry Crumb Cake
Preheat oven to 350 degrees Fahrenheit (175 degrees Celsius).
Beat egg whites and one cup sugar in a bowl until stiff peaks form.
In another bowl, whisk oil, remaining sugar, potato starch, matzah meal, orange juice, egg yolks, lemon juice, lemon zest, vanilla sugar, baking powder, salt, and lemon extract, if desired, until well combined. Fold the batter into the egg white mixture gently, until fully incorporated.
Pour half the batter into a 9×13-inch (23×33-centimeter) pan. Sprinkle frozen
blueberries evenly over it. Pour the rest of the batter on top.









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The ingredient list for the cake indicates 2 1/4 c. sugar. The instructions say to use 1 c. of sugar to beat with the egg whites. There is no indication of where the other 1 1/4 c. of sugar is used.
We've updated this- thank you!