Preheat the oven to 350 degrees F. Line a muffin tin with six silicone or paper liners.
Beat the cream cheese in a medium bowl until smooth.
Mix in the monk fruit sweetener, powdered peanut butter, Greek yogurt, vanilla extract, and egg until creamy.
Spoon mixture evenly into liners.
Bake 15-18 minutes, until centers are just set.
Cool completely, then refrigerate for at least 2 hours before serving.