01 - Place milk, vanilla ice cream, strawberries, and sugar in blender pitcher.
02 - Blend on high speed until completely smooth and creamy, approximately 30-45 seconds.
03 - Taste mixture and add additional sugar 1 teaspoon at a time if desired sweetness level not achieved.
04 - Divide milkshake evenly between two tall glasses, pouring slowly down sides to prevent splashing.
05 - Top each glass with generous swirl of whipped cream, creating peak about 1 inch above rim.
06 - Sprinkle rainbow sprinkles generously over whipped cream while fresh for best adherence.
07 - Insert straw and serve right away while milkshake retains thick, cold consistency.