Place bread in food processor; pulse 10 times or until coarse crumbs measure 1/2 cup.
Combine crumbs, 1 tablespoon butter, and next 3 ingredients in a small bowl. Set aside.
Steam cauliflower, covered, 4 minutes or until crisp-tender.
Transfer cauliflower to a serving bowl. Drizzle remaining butter over cauliflower; toss gently to coat. Sprinkle crumb mixture and parsley over cauliflower. Serve immediately.