Mix the sugar, oil, egg and butter vanilla flavor together. Then add the vanilla yogurt and stir in. Now mix the flour, cornstarch and baking powder and fold into the mixture.
Spread the dough with a tablespoon in a muffin tin lined with paper liners (or just use paper liners). Fill in approx. 1-2 tablespoons of batter per mold. Do not fill the molds too full, as the dough will still rise and may overflow.
Bake in a preheated oven at 175 ° C for about 20 minutes.