You know when recipes indicate a specific size of egg? They’re not just trying to mess with you. In fact, 1 cup of eggs can be made with 4 jumbo, 4 to 5 extra-large, 5 large, 5 to 6 medium or 7 small eggs, so it is good not to use the sizes interchangeably. The good news is that large eggs are fairly standard in U.S. recipes, thus they’re your best bet to keep around if you don’t wish to buy multiple sizes.

Who besides me is crazy enough to keep self-rising flour in the pantry? Honestly, there’s no need to since you can make your own at home. For each cup of flour, add 1 1/2 teaspoons baking powder and a 1/2 teaspoon salt; mix extra and store it in an airtight container for months. Now go forth and bake some 1-2-3-4 cake!

Is there any difference between parchment and waxed paper? Briefly, yes: Parchment has been coated with silicon so it can be used at high temperatures and virtually eliminates the need for greasing a pan. Waxed paper will smoke at high temperatures — and the wax will come off in your food — and is therefore less versatile. I do not recommend swapping the two when lining a cake or roasting pan.

Out of buttermilk and just itching to make some biscuits or lemon cake? Make your own by mixing 1 tablespoon of vinegar or lemon juice with 1 cup of milk and letting it sit until it curdles, about 10 minutes.

To make your own baking powder – some say with fewer metallic undertones than the commercial stuff – mix one part baking soda to one part cornstarch and two parts cream of tartar.

For example: 1/4 teaspoon baking soda + 1/2 teaspoon cream of tartar + 1/4 teaspoon cornstarch = 1 teaspoon homemade baking powder.

[Updated 9/2/10 with this equation for clarity]