Grease and prepare a baking tin with parchment paper all over, including the sides of the tin.
Pit and smash the Medjool dates, flattening them with the side of a knife or something heavy. Evenly spread the dates across the surface of the prepared baking tin and push them down to compress them. You can use a pan, pot, or another baking tin the same size.
Add 2 1/2 tbsp (50g) of coconut oil and all of the peanut butter to a saucepan over low heat. Mix well and allow to melt. Don’t let it simmer or boil—all we need is for it to melt. Remove from heat and let sit for 20 minutes.
Once cooled, pour the melted concoction over the compressed dates and spread well, ensuring everything is covered. Add the roasted peanuts. Store in the fridge overnight or in the freezer for 40-50 minutes.
Add the dark chocolate and remaining coconut oil to the bowl and place it over a Bain-Marie (double boiler). Mix well and allow the chocolate to melt. Once melted, remove it from the heat. You can also do this in the microwave, but I recommend using a Bain-Marie.
Remove the base from the fridge or freezer and pour over the melted chocolate. Use a spoon or angle the baking tin to evenly spread the chocolate over the surface. Sprinkle with sea salt flakes. Place in the fridge for 2 hours, overnight or in the freezer for 1 hour until set.
Remove the Snickers slice from the baking tin and portion it with a hot, dry knife. Store in the fridge for up to 2 weeks or in the freezer for up to 3 months. Dig in.