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.