Start by chopping your garlic and onion and place them in a pan with a good drizzle of olive oil, cook for 5-10 minutes over a medium heat until soft.
Once the onions and garlic are cooked, add in the mushrooms and give it all a good stir, leave to cook for another 5-10 minutes until soft.
Just before serving, add a good pinch of thyme, salt and pepper and stir through your yogurt and lemon juice.
Spoon mushroom mix on top of toast and serve.