Meals that you can make that will last all day?

I am going to uni soon, so usually what I do is cook a meal that can last the whole day or some kind of casserole. (I can't make too much because I share the fridge) I Google one day meals and I get this diet I'm not going to follow.

Usually I do like eggs and bacon that lasts 2 meals, or pancakes I can eat for more than one sitting. But I'm looking for ideas.

I am a fairly decent cook, not hotel level but I cooked for my family for years.