My favorites when my grocery budget is tiny are:
Beans & Rice (I don't make it from scratch, I buy Zatarains, usually with a coupon)
Enhanced Lipton Noodle Soup- I buy the generic boxes from Target for 69 cents and add a 1/2 bag of extra fine egg noodles. The kids and husband love this! I use 2 full boxes of soup mix and make some of the 25 cent canned biscuits with it and dinner costs under $3.00. If I have some leftover chicken meat or veggies in the fridge, I'll add some of them too (celery and carrots chopped thin).
We also love egg noodles with butter and parmesan. I usually serve rolls and a bag of broccoli with this.
Sometimes we'll make a rice a roni meal (3 full boxes!). The family loves the cheese and broccoli version.
Tacos, Hamburgers, and Goulash make a great triple combo. I buy:
(1) 3lb package of ground beef - $6.00
Tomato (3): $1.50
Shredded Cheddar Cheese: $1.50 (store brand)
Taco Seasoning- 50 cents
Taco Shells- $1.00 (Target Brand)
Taco Sauce- $.67 ($1.99 large bottle lasts average of 3 taco meals)
Hamburger Buns - $.99 (store brand)
Bush's Baked Beans - $.99
Spaghetti Sauce- .99 (store brand)
Rotini Pasta (1 Lb) - .69 (store brand)
The first night I make tacos with 1lb of the meat. I try to save a small amount of the cheese for the burgers the next day. The next day, I make Cheeseburgers or Hamburgers with lettuce and tomato slices. I serve some Bush's baked beans with them to make the meal more substantial. The third day, I make the goulash using the last pound of beef (or even less if I used too much for the burgers), a jar of spaghetti sauce and the rotini noodles. I take the leftover tomato and lettuce and fix a nice salad out of them. All three meals are kind of fun and the family loves them. Sometimes in the winter, I'll get some kidney beans and canned tomatoes and make chili in the crockpot for the third meal.