Place butter, coconut oil and peanut butter in a glass bowl.
Microwave on high for 30-35 seconds until butter is melted. Stir together thoroughly.
Add vanilla flavoring and stir.
Add Erythritol and stir thoroughly.
Cook for 90 seconds on high in microwave. Remove and stir thoroughly to be sure sugar sub is dissolved.
I use a candy mold for my candy. Just pour into the mold and pop into the fridge. If you don't have a mold, go ahead and wait for the candy to cool slightly and then form into mounds on wax paper.
Store candy in an airtight container in refrigerator.