1. Bake tart shells according to directions and let cool. In a small sauce pot, melt the chocolate chips and butter over medium-low heat to create a chocolate sauce. Brush the inside of the baked tart shells with chocolate sauce. Allow chocolate sauce to cool.
2. Meanwhile, in a large mixing bowl, whip cream until soft peaks form; add vanilla extract; continue whipping until stiff peaks form. Remove whipped cream from the bowl and set aside in the refrigerator. In the same bowl, combine the peanut butter, cream cheese, and icing sugar and mix until smooth.
3. Fold 1/3 of the whipped cream into peanut butter mixture in three stages; ensuring ingredients are thoroughly blended before each addition. Spoon into tart shells and garnish with peanuts. Cover and chill at least 1 hour or until ready to serve.
Recipe adapted from realcreamrecipes.ca.