First saute your hamburger, onion, salt, and pepper. Brown completely. Drain excess grease and remove it from the pot.
Using a Springform pan, first lightly spray the bottom. Set your first tortilla down. Add hamburger combination, shredded cheese, and pickle, ketchup, and mustard to taste. I just did a light squirt on top.
Continue to layer until you get to the top. (You may also add ketchup and mustard to your meat now if you wish, to add flavor.)
Add one cup of water to the pot. Set pan on the trivet and lower down into the pot.
Set on High-Pressure Manual for 12 minutes with a 2-minute natural release.
Quick-release the remaining pressure and carefully remove the trivet and pan from the pot. Sit to cool for a minute or two.
Serve with lettuce and tomato on top and a little ranch dressing. Enjoy!