Mini Peanut Butter Cup Cheesecakes with a Pretzel Crust

'pretzel dust' (100g of pretzels ground into crumbs.)

melted butter

block of cream cheese {8 oz} softened to room temperature

creamy peanut butter (at room temperature)

sugar

large egg

vanilla extract

heavy cream (called whipping cream in Canada, the kind in the carton)

full-sized Reese's Peanut Butter Cups

melted peanut butter chips or chocolate chips for drizzling (if desired.)