Sponge Cake, Base

	Preheat the oven to 175 °C. Grease the baking pan with butter and line the bottom with parchment paper. The pan size: diameter 22 cm, depth 5 cm.
	Pour flour, sugar, and vanilla into the prepared pan.
	Whip the mixture with a mixer for 10-15 minutes until it doubles in volume and becomes fluffy.
	Sift flour and starch into a deep bowl and add a pinch of salt.
	Mix the egg mixture with the flour.
	Thoroughly stir until a homogeneous texture is achieved, using circular motions.
	Pour the resulting mixture into the pan and place it in the preheated oven for 30-45 minutes, until a golden crust forms.
	Remove the sponge cake from the oven. Turn the pan upside down and gently remove the paper. Allow to cool to room temperature, then you can decorate it.