Fill a copper mug about three-quarters full with large ice cubes, creating a chilled base for your drink.
Use a measuring jigger to pour 1.5 ounces of smooth vodka directly over the ice, listening for the satisfying splash.
Add 1 ounce of unsweetened cranberry juice to the mug, watching it swirl into the vodka and ice, giving the drink a vibrant, ruby hue.
Squeeze the juice of half a fresh lime into the mug using a citrus juicer, then drop the lime wedge into the drink for extra zest.
Top off the mug with 4 to 6 ounces of fizzy ginger beer, filling it nearly to the rim and creating lively bubbles as you pour.
Gently stir the mixture with a bar spoon, ensuring all the flavors combine smoothly and the bubbles stay lively.
Garnish with a handful of fresh cranberries and a sprig of mint for a burst of color and fresh aroma, placing them on top of the drink.
Serve immediately and enjoy the crisp, refreshing taste of your Cranberry Moscow Mule, perfect for festive sips or a lively gathering.