Chicken Pot Pie Biscuit

Ingredients
6 tbsp butter
1 onion, finely chopped
Salt and pepper
5 tbsp plain flour
1 sprig fresh thyme, leaves removed
1 sprig rosemary, leaves removed
3 cups chicken stock
2 chicken breasts
1 cup milk
1 large potato, diced and blanched
1 cup frozen peas, defrosted
4 sheets puff pastry
1 egg, beaten

How To Make it:

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