In a microwave-safe bowl, combine ½ cup creamy peanut butter, ½ cup butter, and 2 tablespoons powdered allulose monk fruit blend.
Heat in 10-second increments, stirring frequently, until the mixture has melted and is well combined.
Stir in 1 teaspoon vanilla extract until fully incorporated.
Pour the mixture into a 12-cavity silicone mold or a cupcake pan lined with parchment liners.
Place in the freezer for 10-15 minutes until the base is set.
In another microwave-safe bowl, combine the chopped chocolate and 1.5 teaspoons of coconut oil.
Microwave at 50% power in 10-second bursts, stirring well after each burst, until the chocolate is completely melted and smooth.
Remove the set peanut butter mixture from the freezer.
Quickly and evenly pour the melted chocolate over each of the 12 peanut butter bases.
Sprinkle a small amount of crushed peanuts on top of each cup.
Place the cups back in the freezer until the chocolate is set, about 5 minutes.
Once set, unmold the truffles and place them in a plastic bag.
Store the truffles in the freezer until ready to eat.
Enjoy these delicious and easy-to-make Keto Chocolate Peanut Butter Cup as a guilt-free treat anytime!