1 cup (2 sticks) unsalted butter, at room temperature
3 cups powdered sugar, plus additional as needed
1 teaspoon pumpkin spice
Big pinch kosher salt
2 tablespoons heavy cream, plus additional as needed
Add the butter to a stand mixer fitted with the paddle attachment and beat until smooth, about 2 minutes. Add the powdered sugar in stages, turning the mixer off to add, then turning back on to beat on low speed. Add the pumpkin spice and salt, then the heavy cream and mix until light, fluffy and smooth, adding more powdered sugar or heavy cream as necessary for the right consistency.