For my sisters 21st b-day i made her a cake. I used fondant, which came out good, but i also wanted to use frosting to decorate it with. The problem was, it was too runny to use to make designs with. The recipe I used called for, butter, milk, vanilla extract and powdered sugar. So i thought that I might have used too much milk. SO i made it a second time using less milk, and it still came out runny. Am i missing something? Or should i try using even less milk? Add cornstarch too it? I don't know. HELP!