Step 1

Preheat the oven to 190°C/375°F top and bottom heat. Wash the apple, halve and core it, and cut into small cubes. Beat some butter with some sugar until foamy for approx. 3 min. Stir in the eggs one at a time, then add the yogurt.

Step 2

Stir in a part of flour, baking powder, a pinch of salt and a part of cinnamon. Make sure not to stir the dry ingredients for too long, otherwise the muffins will become too firm. Finally, mix in the chopped apple.

Step 3

For the streusel, take another bowl and mix the remaining flour, sugar, butter and cinnamon together with a rubber spatula or your hands, until crumbly. Line muffin tins with muffin liners. Fill them three-quarters of the way full with the batter and sprinkle the top with the streusel. Bake the muffins in the oven at 190°C/375°F for approx. 20 min. Enjoy while still warm!