The night before: in a large bowl, mix coffee cake ingredients until blended.
Pour into buttered 9 inch square pan.
Let rise on the counter until it looks like a pillow top mattress.
In the morning, or when you're ready to bake, preheat oven to 350 degrees Fahrenheit.
In a small bowl, combine topping ingredients and sprinkle over top of coffee cake.
Bake for 30 to 40 minutes until toothpick inserted into center comes out clean.
Serve warm with a bit of butter. Reheats fine in the microwave.
