Prepare 1 package of Donut Mix according to the package instructions for donut holes. Cool the donuts completely and spread one side of donut holes with 1 tbsp (15 mL) of strawberry or vanilla frosting and sprinkle with rainbow sprinkles. Slide 3 donut holes onto a wooden skewer.
Melt more frosting in the microwave for about 10-15 seconds (or until melted) and rim glasses and let the frosting drip down. Add sprinkles on top of the frosting, if desired.
Drizzle 1 tbsp (15 mL) strawberry syrup on the inside walls of the glasses.
Pour the milkshake into the prepared glass and top generously with whipped cream, the donut hole skewer, strawberry, extra strawberry syrup and sprinkles. Serve immediately.