Scrape out the seeds from <quantity>1</quantity> vanilla pod

Add <quantity>300<unit>g</unit></quantity> of heavy cream and the vanilla seeds to a saucepan over medium heat

Bring to a boil, whisking constantly, and remove from heat

Pour the hot cream over a bowl with <quantity>300<unit>g</unit></quantity> of chopped milk chocolate. Make sure all the chocolate is covered and let it sit for 2m to begin melting

Whisk until all the chocolate is melted and the mixture is homogeneous

Transfer the chocolate mixture to a piping bag and refrigerate for 8h to set

Preheat the oven to <temperature>180<unit>°C</unit></temperature>

Add <quantity>½<unit>cup</unit></quantity> of hazelnuts to a baking sheet and roast in the oven for 10-12m until lightly browned

Cut <quantity>¼<unit>cup</unit></quantity> of blackberries and <quantity>¼<unit>cup</unit></quantity> of blueberries in half

Pipe the mousse into individual bowls

Enjoy!