Chicken and Mushroom Pot Pie - Rhubarb & Lavender

Ingredients

• 3 bone-in skin-on chicken breasts (or 3 cups diced cooked chicken)
• extra virgin olive oil (as needed)
• kosher salt (as needed)
• pepper (as needed)
• 3 tbsp butter (divided)
• 1 large onion (diced)
• 1 lb cremini mushrooms (quartered)
• 2 garlic cloves (minced)
• 1 tbsp chopped fresh thyme (or 1 tsp dried)
• 3 tbsp sherry (optional)
• ¼ cup flour
• 2 ½ cups chicken broth
• ½ cup heavy whipping cream
• 2-3 dashes Worcestershire sauce
• ¼ cup chopped fresh parsley
• 2 cups flour
• 1 tbsp sugar
• 1 tbsp baking powder
• 1 tsp kosher salt
• ½ tsp baking soda
• 1 stick cold butter
• 2 tbsp chopped fresh sage (or 2 tsp dried sage leaves)
• ½ cup sharp cheddar cheese (shredded)
• ¾ cup buttermilk (plus extra)