I have a 1 element induction cooktop with a 2000 W rating, so roughly 2 kWh at max setting, but I think it is really fast as it doesn't waste energy heating the air around it. Breakfast would take 10min to set up on propane, but now if I doze off, I might burn my food
edit: If you want, you could also build your own solar stove if it makes sense in your region