Easy Chicken Mushroom Pie | Simple Home Edit

Ingredients

• 1 tbsp olive oil
• 1 onion, finely chopped
• 1 tsp freshly minced garlic
• 500 g boneless, skinless chicken thighs, cut into bite-sized pieces
• 1 tsp sea salt flakes
• ½ tsp freshly cracked black pepper
• 500 g button mushrooms, thickly sliced
• 2 tbsp unsalted butter
• 50 g plain (all-purpose) flour
• 375 ml chicken stock
• 250 ml milk
• 1 tsp dried thyme
• 1 tsp dijon mustard
• 50 g freshly grated parmesan
• 1 sheet puff pastry, partially thawed, cut into 12 rectangles
• 1 egg, whisked
• 1 tsp sesame seeds (optional)