3 eggs
2/3 cup milk
1 cup all-purpose flour
1 1/2 teaspoons baking powder
2 tablespoons lemon juice
1/2 teaspoon lemon zest
6 tablespoons butter, softened
1 1/2 tablespoons white sugar
1 teaspoon vanilla extract
Preheat oven to 375 degrees F (190 degrees C). Lightly grease a 9x13 inch baking pan.
In a large bowl, beat eggs, milk, flour, baking powder, lemon juice and lemon zest until smooth. Beat in butter, sugar, lemon zest and lemon zest. Stir in lemon zest, lemon zest, and butter. Combine flour, baking powder, lemon juice and lemon zest; stir into egg mixture until well blended. Fold in the lemon zest mixture and eggs. Pour batter into prepared pans.
Bake in preheated oven for 40 minutes. Using a toothpick, prick center of a roll 3 times, then allow to cool completely. Roll into small circles. Cut into small squares.