Place your mixing bowl and whisk attachment in the freezer.
Add the chopped pecans to a skillet with butter, brown sugar, and cinnamon.
Cook over medium heat, stirring consistently to prevent burning.
After a caramelized sugar crust forms on the nuts, set them aside to cool.To cool them faster, place in the refrigerator. Meanwhile, add the heavy cream, vanilla extract, and a pinch of salt and cinnamon to the cold mixing bowl.
Using a stand or hand mixer, beat the cream mixture with a whisk attachment until medium peaks form, about 3-4 minutes on low speed.
Stir in the sweetened condensed milk until the bowl is silky smooth.
Fold in the cooled buttered pecans, reserving a bit for the top.
Add the mixture to a 9x5 loaf pan. Sprinkle the remaining pecans on top.
Cover the loaf pan with plastic wrap, then aluminum foil. Freeze for at least 4 hours (but overnight is best.) Enjoy!