I recently changed how I eat, mostly chicken thighs, stir fry beef, rice and canned / frozen vegetables depending on the deals for the week. Oatmeal for breakfast.
Meals are clocking in between $0.90 and $2.50 per serving, It's pretty cheap to eat unprocessed foods, it's just gets kind of repetitive. I feel much better than I did when I was eating processed stuff and my food budget is much smaller.