Weigh the flour, caster sugar, baking powder, salt, and chilled unsalted butter into the Thermomix bowl.
Plain flour, Caster sugar, Baking powder, Salt, Unsalted butter
Mix these ingredients for 6 seconds at speed 8.
Heat a large frying pan and add some butter.
Weigh the milk and egg into the Thermomix bowl and mix for 10 seconds at speed 4, followed by an additional 5 seconds at speed 4.
Egg, Milk
Drop small heaped teaspoons of the blini mixture into the pan and cook until browned lightly underneath and bubbles appear on the surface.
Flip the blini and cook until they are cooked through.
Repeat the process with the remaining mixture.