Often, while I’m cooking breakfast, I cook additional ingredients to be used for lunch or dinner. For the week.
My oven has two racks. Why not use them both, if I’m already using one?
(Yours may have more!)
I’m already going to be washing dishes, pots, & pans. Why was more later or tomorrow, separately, when I can wash them all in one batch?
Even before I’m done, if the pan is already dirty from cooking one ingredient, why not cook a 2nd or 3rd right afterwards?
There are many ways to making cooking & cleaning more efficient.
And, if you’re a working parent like me, with many commitments, I think you’ll find the ease of simply heating up something you’ve already cooked in advance on a busy day quite rewarding.