Preheat the oven to 180C/350F degrees
Cut the broccoli into florets and place in a food processor. Blitz until it looks like crumbs then place in a bowl.
Repeat this process for the cauliflower.
Heat the butter in a large saucepan on a medium heat.
Gently saute the garlic for 2-3 minutes.
Add the spring onions, broccoli and cauliflower rice to the pan and cook for 10 minutes, stirring occasionally so it doesn’t burn.
Beat the eggs with the cream and season with the onion powder, salt and pepper.
Add the Cheddar and Parmesan cheese to the egg mixture and stir.
Lightly butter a baking dish and place the broccoli and cauliflower rice in the dish.
Pour the egg and cheese mixture over the broccoli cauliflower rice and mix gently and evenly.
Top with grated cheese is optional.
Bake for 50 minutes until golden and firm.