Get a big pan. Melt the butter on medium-high heat and then add the onion and garlic. Fry until the onion is soft, then stir in the flour.

Once the flour and butter are combined, add the veg stock and the cream. Make sure to add the stock first and then the cream. Simmer for 5-10 minutes.

Add the broccoli, cauliflower and carrots and season with salt & pepper. Cook for a further 10 minutes. At the end, stir through the grated cheese until it is all melted. Then serve!