Whip the ricotta, either with a hand mixer, or a stand mixer. Whip until the ricotta reaches a heavy cream-like consistency. About 2 minutes.
Sift the powdered sugar into the ricotta, and using a spatula, fold into the ricotta.
Add cinnamon, cloves and nutmeg to the ricotta mixture and fold in.
Notes
It's important to use whole milk ricotta, or else the cannoli cream will be too thin and runny once whipped.
If your ricotta is on the wet side, you will need to strain it, or else the filling will be too liquid and runny.
Whipping the ricotta is an imperative step. If you don't whip the ricotta, the cream won't be smooth and creamy- it will be rough and gritty.
How to strain the ricotta:
Place a fine mesh strainer over a bowl. Line the strainer with cheese cloth.
Place the the ricotta in the strainer. Level ricotta with a spatula.
Cover the bowl with plastic wrap.
Place in the refrigerator for at least 8 hours, and up to 24 hours
Discard the liquid from the bowl, and proceed to whipping ricotta, as described in this recipe
You can make the cannoli cream in advance and store it in an airtight container in the fridge for up to 3 days.
Optional: Once you've made your cannoli filling, you can add chocolate chips or nuts like pistachios to the cannoli filling, or even candied orange peel.
If you're making cannoli with the cannoli cream, I suggest buying the cannoli shells. It makes things so much easier and convenient.