Melt the Chocolate: Place the chopped dark chocolate in a heat-proof bowl. In a small saucepan, heat the heavy cream over medium heat until it just begins to simmer. Pour the hot cream over the chocolate and let it sit for about 2-3 minutes to melt.
Combine Ingredients: Stir the chocolate and cream together until smooth. Add the mashed raspberries and vanilla extract, then mix until fully incorporated.
Chill the Mixture: Cover the bowl with plastic wrap and refrigerate for about 1-2 hours, or until the mixture is firm enough to scoop.
Form the Truffles: Use a spoon or a melon baller to scoop out small portions of the truffle mixture. Roll them between your palms to create smooth balls.
Coat the Truffles: Roll each truffle in cocoa powder, crushed nuts, or your topping of choice until well-coated.
Serve or Store: Enjoy immediately, or store the truffles in an airtight container in the refrigerator for up to a week.