Look for canned dulce de leche in the canned milk aisle. You can make these up to four hours ahead of time. Just chill until ready to serve.
Beat cream cheese, dulce de leche, 2 Tbsp. cream, and 1/8 tsp. ground cinnamon at medium speed with an electric mixer until combined. Beat at high speed 1 to 2 minutes or until creamy, stopping to scrape down sides. Spoon cream cheese mixture into a 1-qt. heavy-duty zip-top plastic bag (do not seal). Snip 1 corner of bag to make a small hole. Pipe cream cheese mixture evenly into Flaky Tartlet Shells. Top each with sweetened whipped cream and a pinch of ground cinnamon.