Prepare Your Tools: Grab a large mixing bowl, an electric mixer (or a sturdy whisk), and a spatula. Having all your tools within reach ensures the process is seamless and stress-free.
Cream the Butter and Cream Cheese: In your mixing bowl, combine the softened cream cheese and butter. Beat them together on medium speed for 2-3 minutes until the mixture is light, fluffy, and completely smooth. Use your spatula to scrape the sides of the bowl occasionally, ensuring everything is evenly mixed.
Add the Powdered Sugar: Gradually add the powdered sugar to the cream cheese mixture, about ½ cup at a time. Beat on low speed initially to avoid a sugar cloud, then increase to medium speed until fully incorporated. This step ensures a silky-smooth texture.
Incorporate the Vanilla and Cream: Add the vanilla extract and 2 tablespoons of heavy cream or milk. Beat on medium speed for another 1-2 minutes until the filling is creamy and well-combined. If the mixture feels too thick, add an extra tablespoon of cream, one teaspoon at a time, until you reach your desired consistency.
Taste and Adjust: Give the filling a quick taste. If you’d like it sweeter, add a bit more powdered sugar. For a tangier flavor, mix in a pinch of salt or a squeeze of lemon juice.
Chill (Optional): If you’re not using the filling right away, cover the bowl with plastic wrap and refrigerate it for up to 3 days. Let it sit at room temperature for 15-20 minutes before using to make it easier to spread or pipe.