How to make sponge finger bread sticks?

4 eggs, separated yolk, 150g fine sugar, 100g flour, and half a teaspoon baking powder.

working methods

1. Preheat the oven to 200 degrees, and put the baking paper on two 30 * 45cm baking trays. Stuff a large plastic fresh-keeping bag into the round tube.

2. Put the egg whites in a bowl, stir at high speed until they start to foam, slowly add 2 tablespoons of sugar, and continue to stir until smooth. In another bowl, mix the egg yolk with the remaining sugar. Stir until the color becomes thick and light.

3. Mix flour and baking powder. Pour half of the egg white mixture over the egg yolk mixture. Then mix in the flour, and finally add the remaining egg white mixture. Put the mixed dough into the bag in the tube, then take out the round dough and put it on the baking tray, and bake it in the preheated oven for 8 minutes.