Don't Use Ingredients When Cooking:|
This glitch will allow you to make all the food items you want, without using up the ingredients that go into them. Basically allowing you to make infinite items as long as you have at least one of each of the base items that go into it.
To do so, just select the items to combine as normal, and just as you click the 'Cook' button, hit the Esc key quickly. This will close down the cooking window, and you will see that the item still gets made, but the ingredients that you used won't get removed. Allowing you to make as many as you like.