Lay tofu slices on a paper towel-lined plate and cover with more paper towels. Put a heavy object on top to press out excess water, about 15 minutes; drain and discard the accumulated liquid.
Mix 1/2 cup soy sauce and ginger in a large dish. Add tofu slices and let marinate, about 15 minutes.
Preheat oven to 350 degrees F (175 degrees C). Line a baking sheet with parchment paper.
Flip tofu slices and let marinate on second side, about 15 minutes more. Remove tofu from marinade and place on prepared baking sheet.
Bake in the preheated oven until dry, flipping once halfway through, about 40 minutes. Cut into smaller pieces.
Heat oil in a wok or large skillet over medium-high heat. Add onion and green bell pepper; cook until onion is slightly translucent, 3 to 5 minutes. Add zucchini and mushrooms; cook and stir until lightly browned, 2 to 3 minutes. Stir in baked tofu.
Mix remaining 1/2 cup soy sauce, rice wine vinegar, and chile sauce in a small bowl. Pour into the wok and stir until onion and tofu mixture is well-coated, about 1 minute. Garnish with roasted peanuts.