Mushroom and turkey stroganoff

Ingredients

• 2 medium sweet potatoes, rinsed
• 2 teaspoons olive oil
• ½ medium onion, finely diced
• 1 green pepper, cut into strips
• 1 clove garlic, finely diced
• 240g skinless turkey, diced
• 160g mushrooms, sliced
• 1 teaspoon smoked paprika
• ½ teaspoon Dijon mustard
• 150ml reduced-salt vegetable stock
• 2 tablespoons fat-free Greek yoghurt
• Handful fresh parsley, roughly chopped
• Freshly ground black pepper, to taste