Cook udon noodles (or any noodles) according to package directions (careful not to overcook).
Meanwhile, in a large pan, brown the tofu in a bit of oil until golden brown, flipping every 5 min or so. Season with salt and garlic powder.
Remove and set aside. Back in pan, add peppers and bit of oil, cook until crisp-tender. Add garlic, cook 1 minute.
Add tofu and the sweet chili sauce mixture, stir and cook 1 minute. Remove mixture from pan into a bowl.
Back in the pan, add cooked noodles and noodles sauce mixture. Stir, cook together for two minutes.
Serve the noodles and top with tofu/peppers mixture. Top with sesame seeds if desired.