Line the troughs of a muffin tin (12 troughs) with paper baking cups. Clean and wash the rhubarb, halve it lengthwise and cut it into small pieces. Mix flour, baking powder, 1 tsp. cinnamon and 150 g sugar in a bowl. Whisk egg, milk, yoghurt and oil. Add the flour mixture, mix briefly. Fold in rhubarb
Spread the mass into the troughs. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 20-25 minutes (stick test!). Remove the muffins
Mix 2 tablespoons of sugar and 1 level teaspoon of cinnamon. Whip the cream until stiff, place 1 blob on each muffin and sprinkle with cinnamon sugar
Waiting time approx. 1 hour