I've been buying blueberries on sale each week and baking two dozen wholewheat blueberry muffins. My husband and I have a bowl of cereal each morning and then enjoy a blueberry muffin along with our coffee.
The last two batches of muffins that I made had extra batter left over. After I turned out the first batch of muffins on the cooling racks, I sprayed a few muffin cups and used up the rest of the batter. The last muffins came out fine, but I had to clean up a messy, burned muffin tin since I didn't take the time and wash the muffin tin before using it again. I had to end up using a Brillo soap pad to scour it clean. I don' know why I didn't think of this before, but the second time I was smarter and I sprayed two Pyrex pudding dishes and used the last of the batter. The end result was two giant muffins and just two pudding dishes to wash.