Heat a wok over medium-high heat. Add the oil and swirl it around. Add the minced garlic, ginger, and scallion whites, and let them sizzle for about 1 minute.
Add the pork and increase the heat to high. Use a spatula (or potato masher) to break the pork into tiny pieces. Cook for 2 minutes or until you start to hear sizzling (this means the moisture has been cooked out).
Add the doubanjiang and cook for 2 minutes. Add the ground Sichuan pepper and give it a quick mix.
Add the water, oyster sauce, chicken bouillon powder, sugar, dark soy sauce, white pepper, and MSG. Bring to a boil then gently add the cubed tofu. Reduce to medium heat and cook uncovered for 5 minutes.
Combine the cornstarch with 1 tablespoon of water and drizzle it around the sauce and vigorously shake the pan to thicken (I try not to stir it because stirring will break up the tofu pieces).
Drizzle on chili oil and sprinkle the scallion greens on top. Enjoy!