1 (16 ounce) can prepared chocolate frosting
3/4 cup chocolate-hazelnut spread (such as Nutella®)
3/4 cup confectioners' sugar
1 teaspoon vanilla extract
Combine the chocolate frosting, chocolate-hazelnut spread, confectioners' sugar, and vanilla extract in a large bowl. Use an electric mixer to beat until well blended and fluffy, about 2 minutes.