Preheat oven to 220 C.
Whisk eggs with the cream, a pinch of salt and pepper and the water in a large mixing bowl.
Stir through the broccoli and spinach and 120 g of cheese.
Heat the oil in a large ovenproof frypan over a medium heat. Fry the garlic for 1 minute.
Add the garlic to the egg mixture and stir through.
Wipe the pan down, lightly oil and pour in the frittata mixture. Sprinkle with remaining cheese.
Bake for 15 minutes, until just set in the middle.
Remove from the oven and allow to cool for 5 minutes before serving.