Source: Smitten Kitchen
Note about the pan from Smitten Kitchen:
"Very key here is the size of your loaf pan because this will fill out every speck of it before it is done. Mine holds 6 liquid cups; it’s 8×4 inches on the bottom and 9×5 inches on the top. If yours is even slightly smaller or you’re nervous, go ahead and scoop out a little to make a muffin or two.
You can also make this as muffins. It should make about 18 standard ones and you can distribute the cinnamon sugar (perhaps make 1 1/2 tablespoons sugar and 1/2 teaspoons of cinnamon worth) across the tops before you bake them. They should bake for 25 to 30 minutes."