Cut the tofu into bite-sized pieces and pat dry with a paper towel.
Coat the tofu evenly with potato starch.
Heat cooking oil in a pan and cook the tofu over medium heat until golden brown.
Mix the sauce ingredients (soy sauce, oligosaccharide, gochujang, minced garlic, vinegar, water) together in a bowl.
Add the sauce to the cooked tofu and stir-fry over high heat until the tofu is well coated with the sauce.
Finish by sprinkling sesame seeds and chopped green onions on top.