Anna Olson's Chicken Pot Pie

Ingredients

• 3 tbsp butter
• ½ lb(s) cremini mushrooms, sliced
• 1 medium onion, diced
• 1 large carrot, peeled and diced
• ¼ cup all-purpose flour
• 2 ½ cups chicken stock
• 2 tsp fresh thyme, chopped
• 2 bay leaves
• 4 cups diced cooked chicken, (white, dark or both)
• 1 cup fresh or frozen peas
• Salt and pepper
• 1 recipe Savoury Pie Dough
• 2 tsp baking powder
• 2 cups Cheddar cheese, coarsely grated
• 1 large egg
• 3 tbsp milk