When I was growing up, my mom would make me cinnamon toast for breakfast....sliced bread with butter and cinnamon sugar. Its nice to replace the cinnamon with cardamon sugar.
I also like to sprinkle some on top of a piece of pie before I dig in.
There really isn't a recipe for this...just mix white sugar with cardamon powder. You can as as little or as much as your want, depending on how you want to flavor the sugar.