Fill each date with peanut butter (about ½ teaspoon) and a sprinkle of crushed peanuts. Set aside.
Place the dark chocolate and the coconut oil in a microwave safe bowl and melt in the microwave in 15 second increments, stirring between each. It shouldn't take longer than 1-2 minutes total.
Using a toothpick, dip each date into melted chocolate and use a spoon to coat the date until completely covered. Place chocolate covered date on a platter lined with parchment. Sprinkle remaining crushed peanuts on top of each date.
Place the dates in the fridge to allow the chocolate to set.