Mix 150 g of flour with 1 tsp of baking powder and sift into the egg mass in small portions, stirring gently each time. You can use a spatula, I always use a mixer. Grease the mold with oil and sprinkle with flour. Carefully pour the dough into the mold and bake in a preheated 180 °C oven until ready. Cool the finished cake on the grill. Bake the second cake in the same way. I always bake sponge cakes in the evening and leave them to "ripen" overnight. Then, when slicing, they do not crumble and are perfectly soaked. Here are the cakes I got.