How do you cook for 2 without wasting food?

Any tips on cooking for 2 adults without wasting a lot of food? We struggle with using things up without needing to eat the same things over and over, and then feel guilty throwing things out when they go bad. I particularly care about using up proteins and produce.

I've looked at several online meal plans or apps, but even the ones that say they're meant for 1 or 2 people seem like they're really larger recipes just scaled down. For example, a "2 person" recipe might call for 1/2 pound of chicken breasts and 1/2 of a can of beans, which makes us buy a full pound of chicken and full can of beans and figure out what to do with the other halves. I imagine this problem is even worse for 1 person.

We've tried meal kits in the past but prefer getting groceries from the store for various reasons.

The best things we've figured out so far are:

1. Making larger batches of food and freezing some of it.
2. Having a few "use everything up" recipes that are flexible on the ingredients. For example, quesadillas, stir fry, salads, omelettes can work with whatever proteins and vegetables we have leftover at the end of a week.

Curious to hear what other 2 person households are doing!