Drain tofu and pat dry, then cut into 0.8 in cubes.
Roughly chop chilis.
In a bowl, combine doubanjiang, soy sauce, miso paste, Sichuan pepper powder and half of the water.
Heat up oil in a non-stick skillet over medium-high heat. Add garlic and chilis and stir fry until fragrant.
Add pork to skillet and stir fry until golden brown.
Add tofu cubes and prepared sauce to skillet. Bring to a boil, then reduce heat to a simmer, stirring gently once in a while. Cook for 2 minutes.
In a small bowl, add corn starch and the remaining water and mix until combined. Add this mixture to skillet and let the sauce cook and thicken slightly or to your preferred consistency.
Taste and add more soy sauce and pepper powder if necessary.
Remove from heat and serve with steamed rice or noodles.