*Please use high quality white chocolate, both for the taste and texture to be correct. I prefer using Ghirardelli white chocolate baking bars. You'd need 10 (small) individual squares, or 1ΒΌ bars for 5 ounces.
**I prefer a mix of sprinkles, mainly for the texture. Just don't use nonpareils, they'll bleed when you mix them in the batter. They're perfectly fine to sprinkle on top.
-Frosting is not needed for this recipe. Because they are made with white chocolate, they are naturally sweet. I'd stick with a sugar cookie bar recipe if you want to make frosting π