Lentil, Mushroom & Sweet Potato Shepherd's Pie

Ingredients

• 5 medium sweet potatoes, scrubbed
• 1 cup brown or green lentils, washed and picked over
• 3/4 cup dry steel cut oats
• 1 bay leaf
• 1 teaspoon salt
• 1 tablespoon olive oil
• 1 pound cremini mushrooms, divided
• 1 onion, chopped
• 1 carrot, chopped
• 1 celery stalk, chopped
• 1 garlic clove, minced
• 3/4 cup low-sodium vegetable stock
• 1/4 cup red wine
• 1 tablespoon tomato paste
• 1 tablespoon soy sauce
• 2 teaspoons smoked paprika
• 1/4 cup chopped fresh parsley