Line a mesh strainer with double thickness of cheesecloth.
Place ricotta cheese in strainer, wrap cheesecloth around ricotta cheese, place strainer over medium bowl. Cover with saran wrap.
Place in the refrigerator overnight to drain out the excess liquid.
To make Ricotta Mascarpone Filling:
Beat ricotta, mascarpone, confectioners sugar, vanilla extract, ground cinnamon, and salt together until smooth.
Fold in mini chocolate chips. Cover and refrigerate at least one hour.
Using a pipping bag with a large size tip or use a long handled spoon to fill the cannoli shells.
Roll each end of the filled cannoli shells into the remaining mini chocolate chips.
Drizzle melted chocolate over the filled cannoli shells, sprinkle with cocoa powder.