Combine ground meat, egg, seasonings (feel free to experiment with favourites), crushed crackers and parmesan cheese. Mix well but don't overmix.
Form into loaf and place in cake pan, or any other pot suitable for Instant Pot.
Place lid on pot, being sure to to turn pressure valve to locked positiion. Press manual setting and set timer for 25 minutes.
Prepare the glaze by combining ketchup, brown sugar, and dry mustard.
When cook time is complete, allow 10 minutes before unlocking the pressure valve.
Remove loaf for pan and place on cookie sheet or pizza pan.
Cover with the glaze and broil for 8-10 minutes.
Remove from oven and let rest for approximately 10 minutes.
Slice and serve.
NOTE: Many recipes mention that you can make a tin foil sling to place under loaf in pot. I did and it does help to remove the cooked loaf from the pan. Fold a 12" length of foil until it's approximately 3" wide. Place across the center of pan and up the sides before adding the loaf.