Preheat your oven to 180°C (350°F) and line a large baking tray with baking paper.
Add the apple purée, smooth peanut butter, and plain flour to a mixing bowl. Stir everything together thoroughly until a thick dough forms.
Roll the dough out to about a 5mm thickness. Use a small cookie cutter to cut out your mini biscuits.
Place them on your prepared tray and bake for 10-12 minutes until they are lightly golden and set.
Let them cool completely before serving them to your little one.