In a small saucepan, heat the heavy cream over medium heat until it just begins to simmer. Remove from heat.
Add the semi-sweet chocolate chips to the hot cream and let sit for 2-3 minutes. Stir until the chocolate is fully melted and smooth.
In a mixing bowl, combine the Nutella, crushed hazelnuts, vanilla extract, and a pinch of sea salt. Mix well until combined.
Pour the melted chocolate mixture into the bowl with the Nutella mixture and stir until there are no streaks of Nutella left, and the mixture is smooth.
Cover the bowl with plastic wrap and refrigerate for about 1-2 hours or until the mixture is firm enough to scoop.
Once firm, use a small cookie scoop or spoon to portion out the mixture, rolling it into small balls (about 1 inch in diameter) with your hands.
Roll each truffle in the crushed hazelnuts or cocoa powder until fully coated.
Place the finished truffles on a parchment-lined baking sheet and refrigerate for an additional 30 minutes to set.
Notes
Arrange the truffles in a decorative box or on a platter. You can garnish them with a sprinkle of sea salt or drizzle some melted chocolate over the top for an elegant touch.