1 1/2sticks (12 tablespoons) unsalted butter, at room temperature
2tsp.pure vanilla extract
1 1/2call-purpose flour, toasted (see above)
1/4cwhite chocolate chips
Spread the flour on a parchment-lined baking sheet and bake at 350 degrees Funtil slightly darkened, 12 to 15 minutes.
Gather the flour into a mound and insert a thermometer into the center; it should register at least 160 degrees F. If it doesn\'t, spread out the flour and continue baking, rechecking the temperature every 3 to 5 minutes.
Let cool completely, about 30 minutes.
Beat the butter, sugar, vanilla and salt in a large bowl with a mixer on low speed until combined. Increase the speed to medium high and beat until pale and fluffy, about 3 minutes.
Reduce the speed to low, add the toasted flour and beat until combined, about 30 seconds. Add the milk, increase the speed to medium and beat until creamy, about 30 seconds. Stir in the white chocolate chips and sprinkles. Refrigerate at least 1 hour or overnight.