- ½ cup (1 stick) butter
- 1 cup brown sugar
- ⅓ cup milk
- 3 cups powdered sugar
- ½ teaspoon salt
- Melt butter in a small saucepan. Stir occasionally until it is just brown and foamy.
- Stir in brown sugar and milk. Stir until it begins to bubble around the edges. Allow to cool slightly. Stir in powered sugar and salt vigorously.
- If icing is too thick to spread, stir in more milk, 1 tablespoon at a time. Frost cake quickly.