Technique from my wonderful mother and father-in-law!
Cut the slices of bread in half.
Mix together the cinnamon and sugar.
Mist the slices of bread, one at a time, and coat them in the cinnamon sugar mixture.
Lay coated bread on a baking sheet.
Bake at 220 degrees for 45 minutes and then flip the cinnamon toasts over.
Return to the oven and bake for an additional 45-75 minutes, depending on the thickness of your bread, until the bread does not give when you press on it. You want it to be dry and crunchy.
Store in an airtight container.