Cut the soft tofu and vegetables into bite-sized pieces.
Heat olive oil in a pan and sauté minced garlic.
Add chicken breast and cook thoroughly.
Add vegetables (onion, zucchini, mushrooms) and stir-fry.
Season with chili powder, soy sauce, and pepper.
Pour in broth and bring to a boil.
Add the soft tofu and simmer on medium-low heat for 5 minutes.
Transfer the finished soft tofu stew to a bowl.