Line large baking sheet with parchment paper. Arrange dates on it cut side down and overlapping a bit in 3 rows, 8 dates per row. Press at the end a bit to make sure there are no gaps.
Using small spatula, drizzle and then spread peanut butter on it. Sprinkle with peanuts.
In a small pot or bowl, combine chocolate chips and coconut oil, and warm up on the stove or in a microwave until melted, stirring often. Using small spatula, drizzle on top of bark and then spread it gently to coat. It's OK if some peanuts aren't covered. Sprinkle with flaky sea salt, if you wish.
Freeze date bark for 20 minutes. Using a chef's knife, cut into 20 pieces and enjoy.
Video
Notes
Freeze: Store bark in an airtight container for up to 3 months. You can enjoy it right away straight from the freezer. I tried to store it in the fridge and it's a mess to eat but you can try.