Remove tempeh from package and chop into small triangles or cubes.
Add the tempeh to a shallow bowl and carefully toss in the low-sodium tamari until coated. Allow the tempeh to soak in the tamari for about 5 minutes.
Sprinkle the cornstarch, nutritional yeast, garlic powder, onion powder, smoked paprika, black pepper, and a pinch of salt over the tempeh. Carefully toss until coated. Add the tempeh to the air fryer in an even layer. Lightly spray with avocado oil.
Air fry at 375F for 7-9 minutes until golden brown. Shake the basket occasionally and check often as it cooks fast. If you don't have an air fryer, pan-fry the tempeh in a frying pan over medium-high heat until crispy and golden on both sides.
Whisk together the sauce ingredients in a pan or small bowl. Bring to a boil then reduce to a simmer over medium heat until slightly thickened, about 7 to 8 minutes. Whisking often.
Add the crispy tempeh and continue to simmer until the tempeh is nicely coated and the sauce has thickened, about 3 to 5 minutes.
Serve over jasmine rice and a side of vegetables. Garnish with scallions and sesame seeds. Enjoy!