In a mixing bowl, combine the soy sauce, cane sugar, vegetable broth, rice vinegar, corn starch, ginger powder, and hot chili powder. Stir well until the sugar and corn starch dissolve completely. Set this aside to let the flavors meld.
Heat the vegetable oil in a large skillet or wok over medium-high heat. Add the diced onion and minced garlic, stirring frequently until the onion becomes translucent and fragrant, about 3-4 minutes.
Add the cauliflower florets and green beans to the skillet. Sauté for about 5-7 minutes, or until the cauliflower is tender and slightly golden.
Add the drained chickpeas to the skillet, stirring to combine all the ingredients. Cook for another 2-3 minutes until the chickpeas are heated through.
Pour the prepared sauce over the sautéed vegetables and chickpeas. Stir well to coat everything in the sauce. Allow it to simmer for about 5 minutes, or until the sauce thickens.
Stir in the dry roasted peanuts and season with salt and pepper to taste. Cook for an additional minute, allowing the peanuts to warm up.
Remove the skillet from the heat and transfer the Kung Pao Cauliflower to a serving dish. Enjoy it hot, garnished with extra peanuts or green onions if desired.