I've heard that some people make cinnamon toast by spreading pieces of hot toast with butter and sprinkling with cinnamon and sugar, or by mashing butter, sugar and cinnamon together and spreading that onto toast.
I make it like this.
Cut thick slices of bread.
Toast on one side only under the grill.
Spread the untoasted side thickly with salted butter. It must be salted.
Cover with a layer of sugar and dust with cinnamon.
Flash under the grill. The sugar will melt and bubble very quickly so watch it like a hawk.
The sugar will form a crisp crust as it cools.
Eat while still hot.
The perfect thing for those times when you crave something sweet and starchy and there are no cakes or biscuits anywhere in the house. The makings for cinnamon toast are always there.
Try not to get butter on your yarn.