Soak cashews in hot water for at least 20-30 minutes. Do not skip this step, it's key in creating a silky smooth ice cream.
Place your silicone mold on a baking sheet or large plate and clear a flat space in the freezer before starting.
Add chocolate chips and coconut oil to a microwave-safe bowl. Microwave in 30-second intervals, stirring between each, until fully melted and smooth. Check every 10 seconds for the last 30 seconds to prevent burning.
Spoon 1 heaping tablespoon of melted chocolate into each mold cavity. Use the back of a spoon to spread evenly across the bottom. Reserve remaining chocolate for the drizzle topping
Drain and rinse soaked cashews and add to a high-speed blender with dates, plant milk, peanut butter, and salt. Blend until completely smooth and creamy. If too thick, add a tablespoon (or splash) of plant milk at a time and blend again.
Pour ice cream mixture into each mold, filling almost to the top. Smooth with a spatula.
Top each bar with chopped dates and peanuts. Drizzle with remaining melted chocolate and sprinkle with sea salt flakes if using. Carefully transfer to the freezer and chill for at least 6-8 hours or overnight.
Once fully set, remove from molds and enjoy. Store in an airtight container in the freezer for up to 1-2 months.