Boscastle Aussie Beef Party Pies with Mushroom Gravy

48 Boscastle Party Pies 

2 tbsp olive oil 

85g butter 

900g swiss brown mushrooms, sliced 

4 cloves garlic, crushed 

10 sprigs thyme, leaves picked  

1L good quality beef stock 

1 tbsp Worcestershire sauce 

2 tsp onion powder 

6 tbsp cornflour  

125ml thickened cream 

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