My daughter was watching me as I was making this coffeecake. She asked about the topping being so dry. I explained to her that is what makes the “crumb” portion and it would mix in nicely with the batter once it was cooked.
After I sprinkled the topping on, I took a spoon and pushed the spoon into the batter all around the casserole dish. She again asked why I was doing this to the batter. The spoon pushes the crumb topping into the batter giving the end coffeecake a nice inside and outside texture.