puff pastry thawed
3 cups chicken stock
1/2 tsp. black pepper
1 tsp. salt
1/4 cup all-purpose flour
3 tbsp. butter
3 large carrots cut into chunks
1 large baking potato peeled and cut into chunks
1/2 medium onion diced
3 skinless, boneless chicken breasts cut into 1-inch pieces
2 tbsp. olive oil divided