Mix the dry yeast with some of the luke warm milk en stir until dissolved. Place buckwheat and the flour together in a bowl and make a small circle in the middle. Add the yeast mixture into it. Add the milk and stir until you have a smooth batter. Add the eggs, salt and vanille sugar and stir through. Leave to stand and rise for about 45 minutes. Heat the poffertjespan and add a bit of butter into each hole. Fill halfway with batter and first bake one side until you can see the top dry out a little. Turn the poffertjes around with a small fork and bake the other side until cooked and golden brown. Serve the poffertjes with butter and icing sugar
Add flour, baking powder, and salt in a large bowl and stir to combine. Pour in the milk and stir until combined. Then roll the mixture into a ball and lightly knead until it comes together. Break off about 10 pieces of dough and form them into balls. Set them aside. In a 10-inch skillet, heat enough oil over medium heat to fry the dumplings, until the oil is about 350 degrees. Once the dumplings are browned on one side, flip them and cook until both sides are browned, about 2-3 minutes each. Once done, remove the dumplings from the oil and place them on paper towels or a cooling rack to drain off any excess oil. Serve and enjoy.