Place spinach in a sieve and press firmly to extract excess liquid. Transfer spinach to a large bowl. Add ricotta, parmesan, eggs and shallots. Season with pepper. Mix until well combined.
Lightly grease a 12-hole standard muffin (â…“ cup individual capacity) with cooking spray. Cut each piece of mountain bread into 4 square quarters. Press 2 quarters at different angles into each hole, to line evenly. Spray lightly with cooking spray.
Spoon filling evenly into bread cases. Top with tomatoes. Sprinkle with extra parmesan cheese.
Bake in 180 °C preheated oven for 25 to 30 minutes or until filling is set and bread is golden. Stand tarts in pan 5 minutes. Remove. Serve warm with salad.