Preheat oven to 200 C / 400 F. Grease a 16cm x 26cm slice pan.
Heat oil in a large frying pan or skillet over medium-high heat.
Add all the chopped vegetables except spinach. Season with salt and pepper. Cook, stirring occasionally, for 3-4 minutes or until the veggies are tender.
Add spinach. Cook, stirring occasionally, for another 2 minutes or until the spinach has wilted. Remove from heat. Set aside to cool.
Meanwhile crack eggs into a large bowl. Whisk lightly.
Add cream and dried oregano. Season with salt and pepper. Whisk to combine. Add cooked veggies to this mixture. Mix gently.
Transfer this mixture to the baking dish. Sprinkle with parsley, mozzarella and feta.
Top / decorate with sliced mushrooms and carrots.
Bake for 30-35 minutes.
Slice and serve with your favorite salad.