I made some doughnuts the other day. When I made the glaze for them something went wrong. Granted I was trying to do it from memory but still! I ended up with something more like frosting. The glaze never hardened like it would when my mom made it. I used 3 cups of powdered sugar, 1 TBSP softened butter, 1/2 tsp of vanilla, and just enough milk to wet the mixture. It looked right but after coating about half of the doughnuts, I finally gave up and threw some cocoa in with the glaze mixture and frosted the rest of the doughnuts with it. Any ideas on what went wrong?