Place rice in Multipurpose Steamer. Stir in hot water. Cover; microwave on high until tender and water has absorbed, 15 min.
In a bowl, whisk together seasoning, 3⁄4 cups broth and soy sauce. Set aside.
Meanwhile, heat oil in a wok over medium-high heat. Add pork; stir-fry for 5 min.
Meanwhile, peel carrots; slice diagonally. Trim and discard bok choy stem ends. Cut bok choy into bite-sized pieces.
Remove pork from wok and set aside. Reduce heat to medium, add carrots and mushrooms; sauté until carrots are tender-crisp, 3 min.
Add seasoning mixture, bok choy, pork, and remaining 1⁄4 cup broth to wok. Stir fry until bok choy is just wilted. Serve over rice and sprinkle with topper, if desired.