Chill the Glass: Place a martini glass in the freezer or fill it with ice water to chill while you prepare the cocktail.

Mix the Ingredients: In a cocktail shaker, combine the blue raspberry vodka, lime juice, triple sec, and white cranberry juice.

Add Ice: Fill the shaker with ice.

Shake Well: Shake vigorously for about 15-20 seconds until the mixture is well-chilled.

Prepare the Glass: If you used ice water to chill the martini glass, empty it now.

Strain and Serve: Strain the mixture from the shaker into the chilled martini glass.

Garnish (Optional): Garnish with a twist of lime or a few fresh raspberries if desired.

Enjoy: Serve immediately and enjoy your Blue Raspberry Cosmopolitan.