Prepare Ingredients: Wash and halve the cherry tomatoes, wash the spinach, and grate the Parmesan cheese.
Beat Eggs: In a mixing bowl, whisk the eggs, milk, salt, and pepper until fully combined.
Heat Oil: Heat the olive oil in a non-stick skillet over medium heat.
Cook Vegetables: Add the cherry tomatoes and spinach to the skillet and sauté for 2-3 minutes.
Add Egg Mixture: Pour the beaten egg mixture over the vegetables in the skillet. Sprinkle the grated Parmesan evenly over the top.
Cook Omelette: Let the eggs cook undisturbed for about 8-10 minutes, or until the edges start to lift from the skillet. Use a spatula to fold the omelette in half.
Serve: Carefully slide the omelette onto a plate and serve hot.