A creamy chocolate hazelnut ice cream with a crisp wafer crunch and smooth ripple. It is a delightful dairy-free dessert for special occasions or everyday treats.
Heat the oven to 350 degrees F and line a baking sheet with parchment paper. Toss the crushed chocolate wafer cookies with the coconut oil, roasted hazelnuts, and sea salt.
Bake the wafer crunch for 8 to 10 minutes, stirring once, then cool completely. Freeze the crunch while preparing the ice cream.
Whisk the coconut milk, oat milk, cane sugar, cocoa powder, cornstarch, vanilla, and sea salt in a saucepan. Cook over medium heat, whisking frequently, until steaming and slightly thickened.
Whisk 1/2 cup chocolate hazelnut spread into the warm base until smooth. Refrigerate the mixture for at least 4 hours.
Warm the remaining chocolate hazelnut spread with 2 tablespoons oat milk just until pourable, then cool it to room temperature. Churn the cold ice cream base, adding two-thirds of the wafer crunch during the final 2 minutes.
Layer the ice cream with the chocolate hazelnut ripple and remaining wafer crunch in a freezer-safe container. Freeze for 4 to 6 hours, then soften briefly before scooping.