Peel apple, grate flesh roughly from the core, mix with lemon juice. Line the hollows of a muffin tray (12 hollows) with paper baking cups. Mix flour, oat flakes, cinnamon and baking powder well in a bowl. Lightly whisk the eggs. Add sugar, salt, vanilla pulp, oil, milk and grated apple and mix. Stir in flour mixture
Spread the dough in the troughs and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 25-30 minutes. Take out, place on a cake rack. Leave to rest in the mould for approx. 10 minutes. Lift the muffins out of the trough and let them cool down
Stir the jam and 4 tablespoons of water in a pot until smooth, bring to the boil, remove from the heat, allow to cool slightly, spread on muffins. Decorate with apple slices and cinnamon sticks as desired
Waiting time approx. 45 minutes