Before going to shop, write a shopping list at home. When you are at the shop, you can still put something extra in your cart, but generally be in the "I am fol

Before going to shop, write a shopping list at home. When you are at the shop, you can still put something extra in your cart, but generally be in the "I am following the list" mindset, instead of "I am looking around and see if something catches my attention" mindset. Before writing the shopping list, decide what meals do you want to eat in the following days; then put the ingredients in the list. Otherwise you might end up with too much breakfast stuff, and not enough cooking-material stuff. (Or with cooking-material stuff that you don't know how to put together.) Before even that... if you are not a skilled cook, you could make a list of all meals you can cook, and put it on your fridge. So when you are out of ideas, just look at the list and pick something you haven't cooked recently. You will get greater variety, and you will keep practicing all you have learned.