I feel your frustration, and I give you:
Center Parcs Pudding Cake!
3 eggs
1.5 cups SR flour
1.5 cups sugar
3/4 cup of oil
splash of vanilla
jam or chocolate pieces
Butter the biggest glass bowl that will fit in the microwave.
Cover the bottom generously with jam or chocolate.
Beat all other ingredients together and pour into the prepared bowl.
Microwave for 7 min, until it passes the skewer test. Top may not look cooked.
Turn onto a plate to serve.
Yes, I, too, like to bake on holiday. (I've even baked using a campfire.)
This recipe was invented in Centre Parcs, using what was available. No cake tins, no scales, no whisk (hence oil instead of butter). Dc liked it so much that they ask for it very often.