For the Ice Cream Layer• 1 14 oz can sweetened condensed milk (396g)• 2 teaspoons vanilla extract• 1 pinch fine sea salt ⅛ teaspoon, may substitute table salt• 2 cups heavy cream very cold (473ml)• ⅓ cup sprinkles optional (use “jimmies” or traditional sprinkles, nonpareils are likely to bleed) (64g)• 1 batch stabilized whipped cream frosting
Stir in milk until batter is uniform and completely combined. Slowly drizzle in hot coffee or hot water, stirring until well-combined. Batter will be thin – this is normal!
Divide batter into prepared cake pans. Transfer to center rack of 350F (175C) preheated oven and bake 30 minutes or until a toothpick inserted in center comes out clean.
Allow cakes to cool in cake pan for 15 minutes then run a knife around the edge and carefully invert onto a cooling rack to cool completely before proceeding.
Once cakes are cooled, place in freezer while you begin to prepare ice cream (if you will be storing the cakes longer than an hour, wrap them tightly in plastic wrap before freezing).
Remove one cake layer from the freezer and place on serving platter. Wrap cake collar securely, tightly around the first cake layer and secure with tape.
Cover the exposed layer by placing plastic wrap directly against the surface of the cake and return to the freezer to chill overnight before decorating.