Unless you are going to eat the entire recipe in one day, I wouldn't class this recipe as syn free.
As Ali said, you can have 40g of reduced fat cheddar as your hex a choice, but as you aren't allowed to split your healthy extra a choice, you would have to syn the cheese. (4 syns per 25g = 8 syns for this recipe)
If you used the stated 50g of reduced fat cheddar in the entire recipe, and then split the quiche into 4 pieces, I'd count 2 syns per portion.
You aren't meant to split your healthy extra choices as they are specifically mesured for calcium/fibre content. The only 'splitting' you are allowed to do are with the b choices, and these are stated in the healthy extras list (the 'Grab n Go' section)
Going over your fibre/calcium choices without counting it can have a negative effect on the scales. Not always, but it does happen.
And also, the cheese flavour Mug Shot isn't free. It's 1 syn per packet.
I know this is annoying, but if some people are using this recipe and counting it as free, they're actually having extra syns they won't have counted for and could end up with a gain that they don't expect and shouldn't have.
If you want to make this recipe free, change the Mug Shot for the Cheese & Broccoli Pasta n Sauce as that is free (made just with water), and omit the 50g of cheddar.