Cut the tofu into cubes. Place them evenly on a flat surface such as a cutting board lined with paper towels or a clean towel. Cover with a layer of paper towels, set a baking sheet on top and then something heavy, like a large book or cast iron skillet. Press like this for 15 minutes.
While the tofu is pressing, follow the package directions for preparing the stir fry veggie kit.
In a medium-sized metal bowl, combine the cornstarch, oil and garlic. Toss the pressed tofu cubes into it. You can either pan-fry these over medium heat for 10 minutes or cook them in the air fryer for ~ 13 minutes, at 390 F.
Combine the cooked tofu with the cooked stir fried veggies!