Crack the 4 eggs into a bowl.
Add the 2 tablespoons of milk and whisk until the mixture is smooth.
Season the egg mixture with salt and pepper to taste.
In a non-stick frying pan, heat the 1 teaspoon of olive oil and 1 tablespoon of unsalted butter over medium heat.
Pour the egg mixture into the pan.
Allow it to cook without stirring for about 30 seconds, or until the edges begin to set.
Using a spatula, gently push the eggs from the edges towards the center.
Continue to do this until there are large soft curds.
Flake the drained tuna and add it to the pan.
Gently fold the tuna into the scrambled eggs.
Continue cooking for another 2-3 minutes or until the scrambled eggs are fully set but still moist.
Remove from heat and sprinkle with the optional chopped chives.