Start by boiling a pot of water large enough to submerge the ziplock bags.
In a bowl, crack the eggs and whisk them until well combined. Add salt and pepper to taste.
Add the diced bell pepper, onion, tomatoes, cheese, and herbs to the eggs, mixing until evenly distributed.
Pour the egg mixture into the ziplock bag, squeezing out any excess air before sealing it tightly.
Once the water is boiling, carefully place the sealed ziplock bag into the pot. Cook for about 10-15 minutes, or until the eggs are fully set.
Carefully remove the bag from the water using tongs. Let it cool for a minute before opening.
Gently slide the omelet out of the bag onto a plate and serve immediately.