Mix cinnamon and sugar together in a bowl until well combined.
Preheat broiler to get it hot
Lightly Toast Bread in the toaster (Optional Step, but necessary if you like your cinnamon toast crispy on both sides.)
Spread about 1 ½ teaspoons butter on each slice of toast (Don't really measure it. Just coat the bread with butter.)
Liberally sprinkle the cinnamon sugar over the buttered toast, Getting it out to the edges. (You should be using about 1 tbsp per slice of toast--don't measure it--just guess-timate.)
Arrange prepared slices of bread in a single layer and place under the broiler for 2 to 5 minutes until the sugar is melted and shiny. Watch them carefully, so they don't burn. I like to use a sheet of foil because melted sugar can be difficult to remove from my baking pans.
WARNING!: Allow to cool slightly (for about two minutes) out of the oven before serving. Melted sugar is very hot and sticky and it will burn the inside of your mouth.