Mac 'N Chicken Pot Pie

4 chicken breasts, diced into small cubes

4 tsp butter

1 onion, finely diced

2 carrots, finely diced

2 sticks of celery, finely diced

1 clove of garlic, chopped

1 1/4 cups chicken stock

1 1/4 cups whole milk

6 ounces macaroni (uncooked, about 2 1/3 cups)

6 ounces cheddar, grated

3 ounces mozzarella, grated

5 ounces heavy cream

3 1/2 Tbsp butter

1 tsp dried oregano

1 tsp salt

1 tsp pepper

3.5 ounces sweet peas

12 slices of mozzarella

18oz puff pastry block

1 egg, beaten

1. Heat 2 Tbsp of oil in a frying pan over a med-high heat and add the chicken.  Season with a pinch of salt and fry for 2-3 minutes until the chicken is golden.  Remove from pan.
2. Melt butter in frying pan over a medium heat.  Add onion, carrots, and celery, and cook for 5 minutes or until soft but not quite taking on color.  Add garlic and cook for 1 minute.  Pour chicken stock and whole milk into the pan and bring to a boil.  Add the macaroni, salt, pepper, and oregano, and turn down to a simmer.  Cook for 10 minutes until the macaroni is tender, stirring occasionally to prevent sticking.  Add the heavy cream and stir well.
3. Turn off the heat. Add the chicken and sweet peas, then the cheeses and butter, stirring to combine.
4. Roll out the pastry and trim into a large rectangle that will fit the baking dish and press a piece of dried macaroni around the edges to create a decorate pattern.
5. Pour the mixture into a baking dish and top with sliced mozzarella then the 2nd sheet of pastry.  Brush with egg wash and poke a steam hole in the middle with a fork.
6. Bake at 350 for 25-30 minutes until the pastry is risen and golden.  Serve immediately.