Heat oil in a wok or large skillet over high heat. Add onion, bok choy, carrots, peppers, mushrooms, broccoli and asparagus; cook 5 minutes, stirring frequently.
Step 2
Add soy sauce and cook until vegetables are crisp-tender, about 2 minutes more.
Step 3
Whisk cornstarch into broth in a small cup and add to pan; simmer until sauce thickens, about 1 minute.
Step 4
Spoon stir-fry onto rice on individual plates and top each serving with peanuts. Yields about 1 1/2 cups of vegetables, 1 tablespoon of peanuts and 1/2 cup of rice per serving.