Preheat the oven to 350°F

Place the flour on a parchment lined baking sheet and bake for 5 minutes to kill bacteria

With a mixer beat the sugar and butter together for 2 - 3 minutes

Add in milk, corn starch, and vanilla and beat on high for 1 minute

Add one cup of flour to the bowl and the salt and mix on low until combined

Add the remaining flour and mix until combined; the dough should be the consistency of playdough; add more flour if it is too wet

Chill dough in the refrigerator for 1 hour

Line a baking sheet with parchment paper

Roll dough into 1 inch balls and set on baking sheet and place back into the refrigerator until white chocolate is prepared

Melt white chocolate in a microwave safe dish at 30 second intervals stirring in between each interval until melted

Use a toothpick to dip 20 dough balls into white chocolate and set back on the baking sheet; place sprinkles on top immediately after dipping in chocolate

Repeat to previous steps with the semisweet chocolate for the remaining dough balls; place sprinkles on top immediately after dipping in chocolate

Store in fridge until ready to serve