• Pre-heat oven to 170C / 340F. Lightly grease donut trays.
• Add flour, sugar, baking powder, bicarbonate soda, cinnamon and salt to the Thermomix bowl. Mix for 5 seconds / speed 3. Set aside.
• Add butter to the bowl. Melt for 2 minutes / 60 degrees / speed 2.
• Add milk, yoghurt, egg, vanilla extract. Mix for 5 seconds / speed 4.
• Return dry ingredients to the bowl. Mix for 7 seconds / speed 4. If the mixture is not full incorporated, use a spatula to gently mix it in. Do not over mix!
• Use a piping bag or spoon to divide the mixture between the donut trays. Fill to ¾ full.
• Bake in the oven for around 10-12 minutes until light golden brown. The bottoms will be browner than the top, so don't allow to brown too much.

For cinnamon sugar donuts

• 
  For best results, top with cinnamon sugar while still warm.
• Mix together the sugar and cinnamon on a plate or shallow bowl.
• Melt butter (either in the microwave or in the Thermomix for 2 minutes / 60 degrees / speed 2).
• Use a brush to lightly brush each donut and then dip into the sugar mixture. Continue to press and roll until fully coated.

For glazed donuts

• 
  For best results, allow to cool completely before adding frosting.
• Add icing sugar to Thermomix bowl. Whizz for 10 seconds / speed 9 to remove any lumps.
• Add milk, vanilla and food colouring (if using) and mix for 10 seconds / speed 3.
• Scrape down the sides and repeat. If the frosting seems too runny, add a spoonful of icing sugar; if it seems too thick, add a drop of milk.
• Either transfer to a shallow bowl and dip the donuts in, or use a spoon to pour the icing over the top of the donuts. Sprinkle over sprinkles before the frosting sets.