In a large bowl, add heavy cream. Using a hand mixer or stand mixer, whip until stiff peaks are achieved, about 3 minutes.
In a separate bowl, add sweetened condensed milk and vanilla extract. Stir to combine. Set aside.
In a saucepan over medium heat, add butter and brown sugar. Once melted, add chopped pecans and cinnamon, stirring to coat. Cook for about 2-3 minutes, or until pecans begin to look sticky and mixture thickens slightly. Remove from heat and pour pecans into sweetened condensed milk mixture. Stir to combine.
Gently fold whipped cream into sweetened condensed milk mixture until fully incorporated. The mixture should look fluffy.
Pour mixture into a 9x5 loaf pan (or any container that will hold 6 cups). Cover and freeze immediately for about 4-5 hours or until firm.
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Notes
Depending on the temperature of your freezer, ice cream may need to be frozen overnight to freeze solid.
Pecans can be substituted with any chopped nuts, like walnuts or hazelnuts.
No churn ice cream will keep for up to 3 months in a tightly sealed container in the refrigerator.