Nothing could be simpler than boiled egg and toast soldiers, but I have in the past struggled to get a boiled egg the way I like it.
I boiled four eggs, one for 3 minutes, one each for 5, 7 and 9 minutes. This is how they turned out:
3 minutes - runny yolk, slightly wobbly white.
5 minutes - yolk partially set around the edges, centre still runny. White fully cooked.
7 minutes - yolk set throughout, but not hard. White well-cooked. Good hard-boiled egg for a picnic.
9 minutes - yolk a bit chalky, rubbery white.
If you are making more than 1 egg, it's a good idea to plunge the cooked eggs into a bowl of iced water - this will stop residual heat from cooking the eggs more than you want it.