Line a baking tray with baking paper. Preheat the oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). For the crumbles, whisk butter and brown sugar with the whisks of the mixer for about 4 minutes until foamy.
Then mix flour, 1⁄4 TL salt and baking powder and add to the butter-sugar cream. Knead roughly with your hands to crumbles. Spread on the tray. Bake in a hot oven for about 15 minutes. Take out and let cool down on the tray.
Whip cream with sugar and cinnamon until stiff. Layer shortbread crumbles, cinnamon cream and red fruit jelly alternately in the glasses until all ingredients are used up.