In an electric stand mixer with the whisk attachement, mix the heavy cream on high speed until stiff peaks form (about 2 minutes).
Whisk together the sweetened condensed milk and vanilla extract in a large bowl. Use a silicone spatula and scoop some of the whipped cream into the bowl. Fold together gently. Then add the rest of the whipped cream, folding until smooth and fully combined.
Spread your ice cream base into the bread pan. Cover with foil and freeze for at least 4 hours (overnight is best).
Notes:
Bread Pan: This recipe fits perfectly into a 9x5 inch bread pan, so I highly recommend freezing it this way.Combining Ingredients: When you fold the whipped cream into the sweetened condensed milk, make sure that both of these ingredients are fully incorporated with each other before freezing. If not, they will separate during freezing and you'll have less than pleasant ice cream (definitely happened to me once).