Prepare the Tofu: Start by pressing the tofu to release any excess water. Cut the tofu into even cubes.
Cook the Black Bean Noodles: Cook according to the package instructions. Drain and set aside.
Sauté the Tofu: In a large pan or wok, heat a tablespoon of oil over medium-high heat. Once the oil is hot, add the tofu cubes. Sauté until the tofu is golden brown on all sides. Remove and set aside.
Sauté Vegetables: In the same pan, add a bit more oil if needed. Sauté the diced bell peppers and green onions until they're slightly tender, about 3-5 minutes.
Add Peanuts and Spices: Toss in the roasted peanuts. If you're using dried chili peppers and/or Szechuan peppercorns, add them now for an extra spicy kick.
Add the Sauce: Pour the pre-mixed sauce into the pan. Stir well, ensuring all ingredients are well-coated. Let it simmer for 2-3 minutes until the sauce thickens.
Mix with Tofu: Add tofu back into the pan. Stir everything well.
Garnish and Serve: Garnish with additional sliced green onions and peanuts.