Preheat oven to 375 degrees F.
On parchment paper, draw lines 4 inches apart for rows if you want a guide. The rows should have 1 inch between them. Pencil side down, line a sheet pan with the parchment paper.
In a mixer, whip the yolks and the granulated sugar until light, fluffy, and ribbony; then mix in the vanilla extract.
In a separate clean dry bowl, whip the egg whites on low until foamy, then whip on medium, adding the powdered sugar gradually. Increase the speed to high and whip until stiff. Sift half the flour over the yolks and fold in. Fold in the whipped egg whites then fold in the remaining sifted flour.
Place a large plain tip in a pastry bag and fill it with the batter. Pipe thick stripes of batter, 4 inches long, at a diagonal in finger shapes, leaving 1 1/2 inches in between them to allow for expansion. Sift or sprinkle powdered sugar heavily over the top surface and bake until golden brown, about 8 to10 minutes. Let cool and then peel them off the paper.
Serve with whole strawberries hit with a little whipped cream.