|2 tsp||cinnamon (divided)|
|225 g||butter (softened, divided)|
|210 g||sugar (divided)|
|280 g||flour (divided)|
|2 tsp||baking powder|
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.
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.
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!