Peel, core and grate the apple. Knead all ingredients together. Place 2 teaspoons of dough on a baking sheet and bake at 170 ° C (fan-assisted) for 12-15 minutes until the biscuits are crispy and brown.
The biscuits are not too sweet and have a light apple flavor, if you want it a little sweeter, you can use even more sugar.
Mix the apples with a little cinnamon beforehand, of course, you can also use a little more apple overall. If you like, the oat flakes can also be roasted a little beforehand.