When I was helping to raise 8 stepchildren and their related siblings, my cupcake pans came to the rescue. When I was stuck, I would go to my cupcake pans baking everything from meatloaf to muffins. One morning, when one of the kids told me they needed something sweet for a school function, all I had was a blueberry muffin mix. After getting the mix in the pans, I tossed brown sugar on top. I had seen similar streusel toppings but there was no internet "in those days" and I only had 15 minutes to get these baked and out the door. Once baked, the sugar gave the muffins a little brown finish and automatic icing.