One Pot Cheesy Veg Pasta

• 2 tbsp extra virgin olive oil
• 1 brown onion, finely chopped
• 4 garlic cloves, crushed
• 250 g mushrooms, roughly chopped
• 1 cup frozen peas
• 1 head of broccoli, chopped into bite sized pieces.
• 2 cup pasta
• 3 cup salt reduced veg stock
• 1 cup shredded cheese
• 1 cup fresh parsley leaves, roughly chopped and loosely packed
• 1 lemon, cut into wedges
• 0.25 cup grated parmesan cheese (optional)