My favourite foolproof brekky is just oats with fruit and honey.

I make little baggies of oats (1/3 of a cup of rolled or quick oats with a tablespoon of sultanas) in advance - it takes 2 minutes to put 20 together all in one bash, and then all you do in the morning is empty one baggie into a microwaveable bowl, chuck in 1/2 a cup of water (or milk if you prefer) and nuke it for a minute, stir, and then another minute. Then stir through a teaspoon of honey (or you could sprinkle brown sugar on if you prefer - or it might be sweet enough for you just with the sultanas).

When they're in season, I put in blueberries or strawberries or raspberries. Don't need to chop them or anything. Or you could use banana, apple, whatever. Just nuke the oats and water, and add whatever into it.

It cooks while I make myself a coffee. Done.

The kids love it too

Oats also make an awesome healthy afternoon snack when it's cold in winter.