Pour into pan and bake 50 minutes, or until toothpick inserted in center comes out clean. Cool, then ice. Use an electric mixer or whisk to beat in powdered sugar. Add vanilla and beat until smooth. Spread over cooled cake.
Bread pudding is an inspired use for leftover bread and pieces of bread.
It is a hard sell for some, but others love the stuff and are constantly searching for new recipes. This one uses apples. Melt butter in a wide, deep pot, such as a Dutch oven or deep skillet. Cook over medium-high heat, stirring occasionally, about 5 minutes. Stir in a teaspoon of vanilla and a teaspoon of cinnamon and set aside to cool.