We're in an obesity epidemic and most people don't know how to cook even very basic meals.
Make space for it, squish other classes if you need. Make it mandatory, everyone has to take it. Maybe even ongoing through multiple grades.
Edit: Rice, beans, and even basic meats are cheap. To eat healthy you don't need your meal to be 100% Bell peppers and tomatoes.
That’s a huge part of it, but being equipped with knowledge still makes a pretty big difference, making something like an Aglio e Olio is going to be quite a bit healthier comparatively than a can of chef boyardee overloaded with sugar and salt and for a minimally longer time investment.