Combine the ricotta cheese, powdered sugar, cocoa powder, and vanilla extract in a medium mixing bowl. Mix until smooth, ensuring everything is well incorporated and the cocoa has blended seamlessly into the ricotta.
Fold the whipped heavy cream into the ricotta mixture gently. Be cautious not to deflate the cream; you want to maintain its light and airy texture for a fluffy dessert.
Spoon the chocolate ricotta mixture into serving cups or small glasses, filling them about three-quarters full.
Cover the cups with plastic wrap and refrigerate them for at least 1 hour.
Top each cup with chocolate shavings or chocolate chips before serving. Optionally, add fresh berries and mint leaves.