Clean out the bowl of your stand mixer and gather together all of the frosting ingredients.
Cream together the softened cream cheese and butter, along with a pinch of kosher salt, until thoroughly mixed and smooth.
With the mixer off, slowly begin to add the powdered sugar. Pulse to ensure that the powdered sugar mixes in and doesn't fly out of the bowl. Drizzle in the heavy cream and add the vanilla extract, mixing on medium low. Mix until the liquid has incorporated, but the mixture still feels stiff.
Add in a few tablespoons of orange liqueur, keeping the speed on medium, and then increase the speed to full whip and incorporate air into the buttercream. Run the mixer for a minimum of five minutes.
When the cupcakes are cool enough to frost, place a large pastry tip into the point of a pastry bag. Snip the tip of the bag just enough that the pastry tip extends past the base of the bag but the rest remains securely in the bag. Fill the bag with whipped frosting, leaving enough room at the top of the bag so that you can twist the top and have plenty of room to hold.
Pipe a desired amount of frosting over the top of each cupcake in a swirl pattern, starting by drawing a ring around the outer rim of the cupcake, working inwards towards the center.
With a bowl of toasted pecans available, gently begin pressing the nuts into the buttercream around the edges of the frosted cupcake, leaving the center clear. Repeat with all remaining cupcakes.Store cupcakes either at room temperature or in the refrigerator, bringing back to room temperature before serving.