Add all sauce ingredients to a blender and blend until very smooth.
Bring a large nonstick pan (or wok) to medium-high heat on the stovetop. Add just a bit of water to prevent sticking, and add your tofu cubes. Allow to sauté for 5 minutes, stirring occasionally but allowing them to sit for 1-2 minutes at a time in between stirs. Add small amounts of water as needed to prevent sticking.
Add the red bell pepper and onion to your pan. Allow to sauté 5 more minutes, still stirring only occasionally and adding small amounts of water as needed to prevent sticking.
Add garlic to the pan. Allow to sauté 2 more minutes.
Add your cooked noodles, sauce, and carrots to the pan. Toss until everything is heated through and sauce is mostly absorbed by the noodles. (It may seem like a lot of sauce at first, but it'll reduce down after a couple of minutes).
Add in the green onion, mung bean sprouts, and peanuts. Toss to combine.
Serve and top with additional toppings if desired!