In a stand mixer fitted with a paddle attachment, combine butter and sugars on high speed until light and fluffy.
Turn the mixer down to medium and add eggs and vanilla.
On the mixer's lowest speed, add flour, salt, and baking powder. Mix until just combined.
Stir in sprinkles.
Preheat waffle iron to high.
Using a small ice cream scoop or spoon, put about 1 1/2 tablespoons of dough onto the waffle iron. Close the iron and let the dough cook for 2-4 minutes or until golden brown.
Take the cookies off the iron and dip them into the glaze while still warm.
Set on a wire rack and add sprinkles.