Preheat oven to 180°C. Spray a 20cm (base measurement) square cake pan with oil. Line base and sides with non-stick baking paper, allowing the 2 long sides to overhang.
Heat oil in a large non-stick frying pan over medium-high heat. Stir-fry the vegetables for 3 minutes or until soft. Transfer to the prepared pan.
Use a balloon whisk to whisk eggs and milk in a bowl until combined. Season with salt and pepper. Pour over the vegetables. Bake for 25-30 minutes or until set and light golden.
Set aside for 10 minutes to cool slightly. Serve with salad leaves.
