Creamy mushroom, Brie and pancetta croissants

Name: Creamy mushroom, Brie and pancetta croissants
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Cuisine: European, Mediterranean, French
Ingredients: 50g unsalted butter; 4 rindless bacon rashers, chopped; 2 garlic cloves, chopped; 400g Swiss brown mushrooms, sliced; 1 tbs plain flour; 1/2 cup (125ml) dry white wine; 1/3 cup (80ml) chicken stock; 1/2 cup (125ml) thickened cream; 2 tsp chopped thyme leaves; 4 croissants, split; 150g Brie, thinly sliced