1.To make pizza dough, combine flour, yeast, sugar and salt in medium bowl; make a well in the centre. Stir in oil and enough of the water to mix to a soft dough. Knead dough on floured surface about 10 minutes or until smooth and elastic. Place dough in large oiled bowl, cover; stand in a warm place about 1 hour or until dough doubles in size. Turn dough onto floured surface; knead until smooth.
2.Preheat oven to 240°C/475°F. Oil 2 oven or pizza trays; place in heated oven.
3.Divide dough in half; roll each half on floured surface into 15cm x 40cm (6-inch x 16-inch) rectangle. Place on trays.
4.Combine oil, garlic and half the thyme in small bowl; brush about two-thirds of the oil mixture over pizza bases. Top with both cheeses and asparagus. Brush with remaining oil mixture; sprinkle with remaining thyme, season.
5.Bake pizzas about 15 minutes or until bases are browned and crisp. Cut each pizza into 12 pieces. Serve sprinkled with chervil.