Cut the pressed tofu into bite-sized cubes and set aside.
In a bowl, mix the cornstarch, salt, black pepper, garlic powder, onion powder, and cayenne pepper.
Toss the tofu cubes in the cornstarch mixture until evenly coated.
Heat the vegetable oil in a large skillet over medium-high heat.
Once the oil is hot, carefully add the coated tofu cubes in a single layer.
Fry for about 3-4 minutes on each side or until golden brown and crispy.
Remove the tofu from the skillet and place it on a paper towel-lined plate to drain excess oil.
Garnish with chopped green onions and sesame seeds before serving.
Serve immediately for the best texture.