Prepare the Campfire: Build a medium-sized campfire and allow it to burn down until you have a good bed of hot coals.
Preheat Your Pan: Place a cast-iron skillet on a stable part of the campfire grate to preheat it. Make sure it's hot before proceeding.
Beat the Eggs: In a bowl, beat the eggs until well mixed. Season with salt and pepper to taste.
Add Vegetables: Pour the beaten eggs into the preheated skillet. Sprinkle the diced vegetables evenly over the eggs.
Cook the Omelette: Allow the omelette to cook over the campfire until the edges start to set, and the bottom is golden brown. Use a spatula to lift the edges and let the uncooked eggs flow underneath.
Add Cheese: Sprinkle the shredded cheese evenly over one half of the omelette.
Fold and Serve: Once the eggs are fully set and the cheese is melted, fold the omelette in half using the spatula. Remove from the heat and serve hot.