I make a LOT of soups and one pot meals. This is one of the cheapest, fastest, and yummiest recipes! A bag of potatoes is less than $3.00, and you can find ways to feed a family on that bag of potatoes for a week. (been there, done that)

Easy Potato Soup
Onion, chopped 3/4 cup
Potatoes, peeled, diced 4 cups
Margarine 1 tblspoon
Flour 3 tblspoons
Whole milk 1 quart

Place onions and potatoes in sauce pan. Cover with water and bring to boil. Simmer until soft, about 10 minutes. Drain. Melt margarine in saucepan. Add flour and stir until smooth. Heat to thicken. Add onions and potatoes to milk mixture, and heat to serving temperature. (I will have some bacon bits, sour cream, and chives on the table to add if anyone wants to. Its really good that way too.)

This recipe feeds all 6 of us; so if you don't want leftovers for the next day you can cut back on the amounts.