First preheat the oven. Grease and flour a cup cake tin (Ø 22 cm).
Mix the flour with cornstarch and baking powder and sift into a mixing bowl. Add the rest of the ingredients and use a hand mixer (whisk) to briefly turn everything on the lowest, then on the highest setting for 2 minutes to a smooth dough. Smooth out the dough in the cup cake pan. Put the form on the wire rack in the oven and bake at top / bottom heat about 175 ° C (preheated), hot air about 160 ° C (preheated) or gas level 2-3 (preheated) for about 45-55 minutes.
Let the cake cool in the tin for 10 minutes on a wire rack, then loosen it, turn it out onto a cake rack lined with baking paper and let it cool. Dust the bundt cake with powdered sugar and serve.