In a medium saucepan over medium heat, combine the 1 cup semisweet chocolate, 1 cup nutella, 8 tablespoons unsalted butter, 1/4 cup water1 teaspoon vanilla extract and 1/2 teaspoon coarse kosher salt. Stir until smooth and fully combined.
Place the 8 cups chex cereal into a large mixing bowl (larger than you think you need) and pour the chocolate mixture over the cereal. Gently toss to coat. Do not stir- the pieces will break.
Put half of the 2 cups powdered sugarinto an airtight plastic bag along with half of the tacky cereal. Shake to fully coat.
Sift out onto a rimmed baking sheet to set. Repeat with the other half of the powdered sugar mixture and cereal mix.
Allow the snack mix to set for at least 1 hour before transfering to a plastic container. gently mix with the 1/4 cup mini chocolate chips
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