King Arthur Flour calls them Simply Sinful Cinnamon Muffins...I call them The Best Cinnamon Streusel Muffins You'll Ever Make! Either way you slice it...these are the BEST muffins ever! There's cinnamon chips in the dough, a cinnamon filling explosion in the middle, and more cinnamon in the crunchy streusel topping. There's loads of oatmeal in