Heat 1½ tsp oil in a large cast-iron skillet over medium-high. Cook half the zucchini for 3 minutes per side until browned; remove. Repeat with remaining oil and zucchini. Set aside.
Cook 6 min.
Add. Cook 1 min. Remove pan from heat.
Layer:
Cover and simmer on medium-low for 20 minutes or until noodles are cooked.
Remove pan from heat. Preheat broiler with oven rack in top position. Sprinkle mozzarella over pan; broil 3 minutes or until melted and lightly browned.