Beat 3 eggs on high until foamy.
Gradually add 1/2 cup sugar. Beat high for 8 minutes.
Whisk 1/2 cup flour and 1/2 tsp baking powder.
Sift dry mixture, then add in thirds to eggs. Fold after addition.
Once mixed, add 1/2 teaspoon vanilla extract.
Line a springform cake pan or flan tart pan. Don't grease sides.
Bake for 25 minutes at 350. Let cool.