Put pieces of bread in a microwavable bowl/ramekin (about 200ml/1 cup).
Sprinkle with sugar/Splenda/maple syrup and spices (if using).
Pour over milk to taste (at least enough to cover the bread).
Microwave on high for 1 minute, or until milk starts to bubble.
Sprinkle with extra sugar if using, then either put ramekin straight under the grill, or transfer into a grillable bowl, then grill for 3-5 minutes depending on grill or how crunchy you want the top to be.
Remove from grill and eat with a teaspoon. Make sure it's not too hot, sometimes the milk underneath the top is still boiling. I like it with a crunchy top and lots of milk underneath where the bread's totally disintegrated, you can try with more or less milk to get the consistency you want.
If you don't have a microwave, you can bake in the oven for 20-30 minutes, then grill. Or alternatively if you don't have a grill, it still tastes great eaten straight from the bowl after microwaving.