Set timer to 8 minutes preheat toaster oven to 300 and put burger on at medium high.

At 6 minutes left put bun in toaster oven.

With 4 minutes left flip the burger and spread Dijon mustard on the bottom bun and put it back in the toaster oven.

With 2 minutes left put swiss cheese on the top bun.

When timer is up take the bun out of the toaster oven place the burger on the top bun spread mayo on the bottom bun squirt a little ketchup on the bottom bun close and enjoy