My mom used Bisquick for practically everything, and we always got to "help" There were six of us so she always bought the largest box available, we had muffins, coffee cake, pancakes... Some of my earliest cooking memories were of using the pantry stool and getting the box down to bring to the table.
I am a social worker in senior housing and every month the residents have a breakfast. My job is to bring the coffee cake. I like the basic recipe and add fruit, coconut, mini chips. The residents like it because it's not too sweet, and I change it up every month.