4 ounces cream cheese, softened
1 (14-ounce) can sweetened condensed milk
1 large lemon juiced, then zested,
1 teaspoon kosher salt
For the filling: In the bowl of an electric mixer fitted with the whisk attachment, whip the heavy cream to stiff peaks. Transfer to a medium bowl and refrigerate.
In the same mixing bowl of the electric mixer fitted with the paddle attachment, beat the cream cheese on medium speed until smooth. Slowly pour in the condensed milk and continue to mix until incorporated and smooth. Add the lemon zest and juice and salt and beat on medium-high speed until combined, 1 to 2 minutes.