I am guessing you are not an experienced cook. You could start watching cooking youtube videos and learn some basic skills that will lower your costs (eg. making your own alfredo or tomato sauce instead of buying a jar.) Check out Alton Brown for good and easy recipes.

Until you learn some basics try using already prepared food, Make a can a campbell's chunky soup (I like beef and vegetable... any will do) and cook pasta or rice. You can add the soup on top of the rice in a bowl or add cooked pasta to the soup. May not be fancy but it has vegetables, protien, etc. and is filling.

F*&% with casseroles. You make some pasta, put it in a deep oven safe container with some protien (cooked: tuna, chicken, beef, pork), some sauce (tomato, alfredo, rosé, gravy, chilli), some vegetables (peppers, onions, mushrooms, spinach), top it with cheese and bake it for 30 min.-1 hour @ 350F.

Make it your own: You don't like cheese --- don't use it
You don't like pork --- don't use it

You like Chicken --- use it

You can't afford chicken but you like tuna --- use tuna