Cut cauliflower into florets.
Mix all the batter ingredients in a mixing bowl: chickpea flour, all-purpose flour, cumin, salt, pepper, and nondairy milk. Add up to 1/4 cup more milk if necessary.
Toss florets in the batter until they are all coated. Air fry for 10 minutes at 400 F or oven bake for around 20 minutes at 400 F. Depending on the size of your air fryer, you may need to do two batches. Toss them around in the basket in the middle of air frying.
While the cauliflower air fries, mix the sauce ingredients in a small bowl and the cornstarch slurry in a separate bowl.
Heat a medium saucepan over medium heat. Add the orange juice sauce. When it starts to bubble, add the cornstarch slurry. After the sauce has thickened a bit, toss the cauliflower in, take the pan off the heat, and coat the cauliflower in the sauce.
Serve with rice or noodles and top with scallions, sesame seeds, and extra red chili flakes.