Press tofu for at least 20 minutes to remove moisture, then cut into evenly sized cubes.
Place tofu cubes in a mixing bowl, sprinkle with cornstarch and toss gently until evenly coated.
Preheat air fryer to 375°F (190°C). Arrange tofu cubes in a single layer on air fryer basket, spray lightly with vegetable oil.
Air fry tofu for 15-20 minutes, shaking the basket halfway through cooking until crispy and golden.
While tofu cooks, chop vegetables and steam or sauté until just tender-crisp to maintain color and crunch.
Toss the hot, crispy tofu cubes with sweet chili sauce until well coated, allowing the sauce to glaze the tofu.
Assemble bowls by layering cooked rice or grains, then topping with saucy tofu and cooked vegetables.
Garnish with sliced green onions and sesame seeds for a fresh, nutty finish.