i have a stovetop pressure cooker, I eat a lot of beans and grains - not every day but at least 2 or 3 times a week

beans & rice/quinoa is a good one - easy to make. they’re cheap, easy to get, easy to buy in bulk, and have a shelf life of several years.

standard process, for me:

soak 1 1/2 cups of beans for 8 - 12 hours
add a bit of fat to the pressure cooker, then the beans, and just enough water to cover the beans. add pepper, dried chilies, bay leaves, etc - no salt though
cook for ~25 minutes at pressure, let the pressure reduce naturally
when done, add salt, if desired.

rice/quinoa - i prefer this to just rice by itself, the quinoa has a subtle nutty flavor.
same process for cooking as the beans, but you can add salt to the grains. ratio of grains to water is 1:2. i usually use 1/2 cup rice, 1/2 cup quinoa, and 2 cups water.
cook for 4 minutes at pressure, let the pressure reduce naturally

beans over rice or rice and beans all mixed up. doesnt really matter. this sort of meal is where sauces are really useful. I’m a big fan of hotsauce, but a soy-based teriyaki sauce or something similar works just as well. maybe just salsa? whatever you want really.

this usually makes 2 or 3 big portions.