Place the loaf pan, mixing bowls, and beaters in the freezer for 30 minutes.

Add sweetened condensed milk to a medium bowl.

Slowly stir Dr Pepper into the condensed milk, ensuring gentle mixing to reduce bubbles.

Remove the chilled mixer bowl and attachments from the freezer.

Beat cold heavy cream until stiff peaks form, about 1 ½ to 2 minutes.

Gently fold the whipped heavy cream into the Dr Pepper mixture in stages.

Transfer the mixture into the chilled loaf pan and smooth the surface.

Cover tightly with aluminum foil and freeze for 6 hours until firm.

Serve scooped into bowls or cones, or pour additional Dr Pepper over for floats.