Heat the oven to 200 C (392°F).
Grease the casserole dish with some butter and leave it aside.
In a small pot, melt the butter over low heat.
Add the sugar and mix until you get a creamy and uniform composition.
Pour the butter and sugar mixture into the saucepan, so that it covers the bottom of the casserole in an even layer.
Then, put the sliced bread cubes in one layer.
In a bowl, add eggs, milk, vanilla and cinnamon. Mix the composition well and pour over the layer of bread so that it covers and soaks the whole bread in the composition.
Sprinkle over a spoonful of coconut sugar.
Put the casserole in the oven and let it bake for 25-30 minutes, or until it browns on the edges.
Serve with cream cheese or ice cream.