1Crack the 4 large eggs into a bowl and beat them well until the yolks and whites are fully combined.
Grate the 100g of cheddar cheese and set aside.
Chop the 2 medium tomatoes into small pieces.
Heat 1 tablespoon of olive oil in a non-stick frying pan over medium heat.
Pour the beaten eggs into the pan and let them cook for a minute or until they start to set around the edges.
Sprinkle the grated cheddar cheese and chopped tomatoes evenly over one half of the omelette.
Use a spatula to gently fold the other half of the omelette over the cheese and tomatoes.
Continue to cook for another 2-3 minutes, or until the cheese has melted and the eggs are fully cooked.
Slide the omelette onto a plate and serve immediately.