Sort the blueberries, wash and drain. Wash lemon hot, grate dry, tear off half of the peel in zests, grate the remaining peel finely. Halve lemon and squeeze. Line the depressions of a muffin tray (12 depressions) with paper baking cups
Mix flour, oat flakes and baking powder well in a bowl. Lightly whisk the eggs. Add sugar, salt, vanilla pulp, oil, milk, 6 tablespoons lemon juice and grated zest and mix well. Stir in flour mixture, 100 g blueberries and lemon zest
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 remaining blueberries, lemon zests and mint
Waiting time approx. 45 minutes