Preheat the oven to 180 ° C fan oven. Line muffin baking tins with paper liners.
Peel and chop the apples and drizzle with lemon. Spoon the yogurt into the mixing bowl and rinse the mug. Using the beaker, measure out the sugar, flour, almonds and the oil. Add the eggs and sugar to the yogurt and stir until frothy.
Add the flour, almonds, vanilla sugar, cinnamon, baking powder and oil and stir well. Fold in the apple pieces. Pour the mixture into the molds until they are full to the brim.
Place the muffin tins on the middle rail of the oven. Turn the oven temperature back to 160 ° C and bake the muffins for about 25 minutes.