Preheat oven to 180C/350F.

Whisk eggs, milk, salt and pepper.

Heat oil in a well seasoned skillet or non stick pan (about 26cm / 11") over medium high heat.

Add bacon and cook until almost golden.

Add garlic and cook for 30 seconds.

Add spinach and toss until just wilted - bacon should now be golden.

Turn heat down to medium. Remove about 1/3 of the bacon spinach into a bowl (for topping).

Add butter into the pan and swirl/spread across base of the pan.

Pour in about 2/3 of the egg mixture. Scatter over half the cheese, then pour over remaining egg mixture.

Scatter over reserved bacon and spinach, then cheese.

Cook for about 3 minutes until the sides are just set but not golden - check with knife.

Transfer to oven and cook for 8 minutes until the centre is just set and the cheese is melted on top.

Rest for a few minutes then slice and serve.