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Separate or cut the bun into its two halves to get it ready to put in the toaster. Make sure to cut it in half evenly if you have to cut it apart so it will fit in the toaster.  This method of toasting will only work for hamburger-style sandwich buns. You'll need a toaster with large enough slots to accommodate the bun halves. You won't be able to use this method for hotdog buns or other irregularly-shaped buns. Don't put butter, olive oil, or any other substance on the buns before using a toaster to toast them. It will just burn and cause a lot of smoke and a mess. Different toasters have different settings that you can alter to adjust the toast cycle. Pick one of the medium-range settings to toast the bun so you don’t burn it. You can alter the settings after the first bun you toast to toast future buns more or less. Some toasters even allow you to adjust the heat while toasting. Place the bun halves inside and press the lever down to start the toaster. Wait for toaster to automatically finish its toasting cycle and eject the toasted bun.  It doesn’t matter which direction the bun halves face when you insert them into the toaster. Unlike other methods, this procedure will toast the bun halves on both sides, resulting in a bun that is drier and more crumbly.
Split the bun into 2 halves. Set the toaster to medium heat or a medium level of toasting. Toast the bun for the full toasting cycle.