
Line a 9x5 loaf pan with parchment paper. Place in the freezer.
Combine sweetened condensed milk and vanilla in a large chilled bowl.
In a separate chilled bowl, whip heavy cream on medium high until stiff peaks form.
Gently fold the whipped cream into the sweetened condensed milk. (Stir in any mix-ins you'd like at this point).
Pour into prepared pan, cover with plastic wrap and freeze at least 4 hours or overnight.