Sounds like yall need some Grubmaster Training...
Plan a Menu..Including Portions....Adjust as needed...Stick to the Menu...
You need certain Stables...Salt, Pepper, Garlic Salt, Flour, Sugar, Beans, Brown Sugar, Tabasco Sauce (or prefered Brand of Hot Sauce), Coffee, Hot Chocolate, Tea, Lard and Dried Herbs and Spices. All other Ingredients need to be purchased as needed.
You will get it down where there are no leftovers...