I'm sad that this is worth mentioning. But if you are dealing with hunger amid threats to SNAP benefits, rice and beans are very cheap per meal and can be bought in bulk. Here's some tricks I've learned:
If you get dried beans, make sure you follow the directions to pre-soak them. Canned beans are easier to prepare, just dump in near the end of cooking to heat them up. Dried lentils don't need to be pre-soaked, but I prefer to cook them separately and drain the water they boil in.
Brown rice, barley, or other whole grains have much more protein than white rice and I find them more filling. Whole grains take longer to cook than white grains.
Frying diced onions in the pot before adding the grains and water is an easy way to kick the flavor up a notch. Use a generous amount of cooking oil (light olive oil is healthiest) for cost effective calories and help making the meal more filling.
Big carrots or celery in bulk are pretty cheap too. I like to dice carrots by partially cutting length wise into quarters, but leave the small end intact to keep the carrot together to make it easier to dice down the side. Add them to the same pot as the grains after the grains start to soften. Beets are also great; skin and cube then boil separately until soft. Change up your veggie to get a mix of vitamins
Get some bulk garlic powder, hot sauce, paprika, cumin, crushed red pepper, black pepper, etc. Season and salt the pot to taste.
You'll only need 1-2 pots and a cutting knife/board for veggies.
I recommend Harvard's Nutrition Source for science-based nutrition information and they have some recipes too
Edit: discussing big changes in diet with a primary care doctor or registered dietician is generally a good idea.
Probiotic supplements may help with gas.
As a bonus this sort of meal has a very small environmental footprint.
A quick point to add. Adding fat to your meal makes it more filling and for longer. The worst fats are trans fats, second worse are polyunsaturated fats, and mono seem to be fairly good along with most saturated fats. In terms of cost some of the vegetable fats are much cheaper but they often have trans fats which are essentially toxic and they also go rancid very easily.
Saturated fats are generally solid at room temperature and don't absolutely need to be refrigerated on cool to moderate weather days. If you would sweat the butter would too, so put it in the fridge.
If you add a small amount of mince to your beans it will stretch really far and add tonnes of flavour and protein without breaking the bank. Cheaper mince comes with more fat but if you are making beans you want that, so get the cheaper mince, lean is not helpful.
Beans on rice freezes well for weeks. Beans without rice is good for months frozen. Beans with rice and any cheese or sour cream is not OK frozen. Beans with cheese microwaves well, but add sour cream after heating.
To make it more satisfying you can add a little bit of some chilli sauce. Hotter sauces go further, but the best is fermented sauces. The cheapest chilli sauces are full of sugar and water, so they just sweeten and dilute rather than flavour your dish.
If your beans tastes sour add a small amount of sugar, stir for a minute, and test again. Sugar fixes the sourness quite well.
For extra flavour a stock cube can be added. I would recommend beef stock for beans, but it will work with chicken or fish too. Most stocks are now vegan because they re synthetic, but they add a lot of flavour and are perfectly fine to eat.
The best option if you can manage it is to learn how to make a beef broth from bones. You boil the bones for hours, around 8 or so should do, and the bones will start to soften and become translucent. At this point all the nutritional goodness of the bones is in the broth. You can then use this as a base for making stew, beans, soup, etc, or you can reduce it by open top heating it and letting the steam leave. This will make a strong stock you can use to add flavour and nutrition to other meals for the cost of some energy and cheap bones.
A slow cooker can make cooking all of this much easier and safer. Electric slow cookers are able to be set up in the morning and have dinner most of the way ready by dinner time. The slow steady heat is great for bones and for softening meat and the easy of use is just fantastic.
Thanks for contributing. Some of your content on fat is not supported by evidence. Omega-3 polyunsaturated fats are the healthiest fats, and saturated fats increase risks of heart disease.
Here's a great article from the Nutrition Source discussing these concerns head on. TL;DR