Chill your copper mug in the freezer for about 10 minutes to keep the drink icy cold.
Fill the mug generously with ice, creating a frosty base for the cocktail.
Pour in 1.5 ounces of vodka, ensuring a smooth, neutral foundation for the flavors.
Add 2 ounces of cranberry juice, giving the drink a tart, festive hue.
Squeeze the juice of half a lime into the mug, then drop the wedge in to infuse brightness and zesty aroma.
Top off the drink with about 4 ounces of ginger beer, watching the bubbles fizz and rise, creating a lively sparkle.
Gently stir the mixture with a long spoon or stirrer, blending the flavors without losing the carbonation.
Garnish with a handful of fresh cranberries and a sprig of mint for a colorful, aromatic finishing touch.
Taste the drink and, if desired, add a splash of simple syrup to mellow the tartness.
Serve immediately and enjoy the crisp, tangy sparkle of your Cranberry Moscow Mule.