Heat a large pan on medium heat with oil and fry tofu on all sides until golden brown, then set tofu aside.
On the same pan, saute onion and garlic for about 2 minutes.
Add sliced shiitake mushroom and saute for about a minute.
Add 3 cups of water, cover with lid and bring to boil
Add soy sauce, oyster sauce, sugar, black pepper and mix until well combined.
Then add pre-soaked sotanghon noodles and mix until noodles are covered with the sauce, then set aside.
In the same pan, add 1 cup of water and bring to boil.
Next add chayote, carrots, baguio beans, cabbage, bell pepper, and saute for 2 minutes.
Add noodles in the mixed vegetables and mix it until well combined.
Serve Immediately.