For the hazelnut toffees, mix butter, egg and sugar until fluffy. Mix in flour well.
Preheat oven to 170 °C. Butter a baking tray.
Spread the dough on the baking sheet and bake for about 20-25 minutes.
For the toffee mixture, add butter, sugar, salt and cappuccino milk and simmer for 5-8 minutes, stirring constantly. Stir in chopped hazelnuts.
Then spread the toffee mixture evenly on the pre-baked pastry base. Bake again at 170 °C for approx. 15 minutes.
Then let the pastry cool on the baking sheet in the refrigerator, or outdoors.
Cut the hazelnut toffees into 2×2 centimeter pieces and enjoy.