Vegetarian Shepherds Pie

• 1 tbsp extra virgin olive oil
• 1 onion, finely chopped
• 1 cup peas, corn carrot mix
• 1 capsicum (bell pepper), seeded and finely chopped
• 250 g mushrooms, peeled or cleaned and chopped
• 400 g plant based mince
• 1.5 cup vegetable stock
• 2 tbsp tomato paste
• 3 tbsp HP Brown Sauce (or BBQ sauce)
• 2 potatoes
• 1 A good grinding of salt and pepper