Keto Peanut Butter Cups

Combine butter and coconut oil in a saucepan over low heat and melt completely, 4 to 5 minutes. Stir in peanut butter. Heat, stirring continuously, until fully combined with the fat. Combine erythritol confectioners' sugar, cocoa powder, and pink salt in a bowl. Stir into peanut butter mixture until well combined, 2 to 3 minutes. Mix in heavy cream and vanilla extract until well combined.

Stir in chocolate chips. Continue stirring until chocolate chips are completely melted, 3 to 5 minutes. Remove from heat.

Line a cupcake tin with silicone baking cups. Spoon peanut butter mixture into baking cups, about 1 1/2 to 2 tablespoons per cup. Freeze until solid, 15 to 20 minutes. Remove from silicone cups and store in a tightly sealed container in the fridge.