Preheat oven to 450 degree F. Roll out pie dough. Cut 36 (3 1/4-inch) rounds. Press each pastry round into 2 1/4-inch tartlet pans. Bake in preheated oven for 8-12 minutes until golden brown.
Combine cream cheese and condensed milk in a bowl. Using a hand mixer, mix on medium speed until uniform. Mix in Key Lime Curd on low speed until combined. Spoon mixture into prepared crusts and refrigerate at least 4 hours before serving. Can be made a day ahead.
Serve with sweetened whipped cream and lime zest garnish.