Gather all your ingredients: melted chocolate, heavy cream, softened butter, and chopped toasted hazelnuts.

In a mixing bowl, combine melted chocolate, heavy cream, and softened butter. Whisk together for 2–3 minutes until smooth.

Fold in the chopped toasted hazelnuts gently using a spatula.

Allow the mixture to cool at room temperature for about 15 minutes to thicken.

Check the consistency; it should be thick yet spreadable. Refrigerate if too soft.

Use the filling as needed for cakes, fruits, or toast. Store any leftovers in an airtight container.