Gluten Free Shepherds Pie

Name: Gluten-Free Shepherd's Pie
Ingredients: 1 tsp extra virgin olive oil; 3 tbsp tomato paste; ½ tsp salt; ¾ cup dry red wine; 2 tbsp extra virgin olive oil; 1 medium onion, chopped; 1 large parsnip, diced small (about 1¼ cups); 2-8oz packs babybella or crimini mushrooms, sliced; 1 (150g) pack roasted and peeled chestnuts, quartered; 2 tsp chopped fresh thyme; 1 tsp chopped fresh rosemary; 10-12 medium size Yukon Gold potatoes (about 2 lbs); 1 tsp salt; ¼ tsp black pepper; ⅓-1/2 cup extra virgin olive oil; ¾ cup vegetable broth or unsweetened almond milk