This is a great way to use up leftover cooked vegetables and odds and ends of cheese in your fridge. Provided you keep to the below weights, you can use pretty much anything you like!
Based on 4 servings, adjust as needed.
Preheat your oven to 200°C/180°C Fan. Grease a 20cm spring-form/loose-bottomed cake or quiche tin with a little of the butter.
Push the first tortilla into the base of the tin slightly off-centre, so that one of its edges rises up one side of the tin, and brush with a little butter. Place the next tortilla on top, again off-centre but covering a different sides of the tin. Repeat with the third tortilla, making sure to brush with butter in between each layer. You want the sides of the quiche to be about 2.5 - 3cm high and everything to be covered with butter. Place in your oven for 5 minutes and blind bake until starting to turn golden and firm up.
Meanwhile, whisk together egg, milk, cheese, peas, chives, salt and a pinch of black pepper with a fork, in a jug.
Remove the tin from your oven and brush the tortilla case with any remaining butter. Pour the egg mixture into the tortilla case then put back in the oven for 25-30 minutes, or until just cooked through.
Whilst the quiche is cooking, prepare your classic green salad. Whisk together the white wine vinegar, Dijon mustard, sugar and olive oil. Season to taste. Combine with the lettuce and avocado in a large salad bowl.
Once cooked, leave the quiche to cool a little before removing from the tin, slicing and serving. If you want to neaten the crust up a bit, then the top can be trimmed with scissors or a sharp knife. Serve with your green salad on the side.