Add the onion and carrot and saute for approx 5 mins
Add the flour and cook this off for 2 minutes, ensuring the veggies all get coates
Add the stock and milk, bring the mix up to a simmer
Dice the chicken (1cm cubes) Add the chicken and poach at a low simmer for 10 mins
Add the uncooked pasta and cook for a few minutes less than the suggested cooking time (this will vary depending on the size and shape of pasta you are using)
Add the frozen peas, Check the consistency of the soup at this stage, if it has thickened more than you would like thin down with a little more stock. Cook for 1-2 minutes to ensure the peas are heated through
Season with salt and pepper if needed
Serve
Notes
The butter can be substituted for oil if you prefer
Celery can be added at the same stage as the carrots and onion (I dislike celery though)
Sliced button mushrooms are nice in this as well, I often add a handful of them after the onions and carrot have had a few minutes to sauté but before the flour has been added
Personally I have not made this recipe with anything other than cows milk, but it should also work with alternative milks