Preheat oven to 220°C / 425°F (or air fryer to 200°C / 400°F). Line a baking sheet and place a wire rack on top.
Cut cauliflower into even florets and pat dry.
Whisk eggs in a bowl. In a shallow bowl, combine almond flour, Parmesan, garlic powder, onion powder, smoked paprika, salt, and pepper.
Dip each floret into egg, then press into the dry coating. Place on rack (single layer).
For oven: lightly brush/spray with olive oil and bake 18–22 min, flip halfway, until golden and crisp. For air fryer: air fry 10–12 min in batches, shaking halfway.
While crisping, make the glaze: simmer tamari, sesame oil, rice vinegar, allulose, ginger, garlic, and chili paste 1–2 min until glossy; whisk in a tiny pinch xanthan if thicker glaze desired. Remove from heat.
Toss crisped cauliflower in a large bowl with warm glaze until evenly coated. Return to oven/air fryer 1–3 min to set glaze and re-crisp.
Garnish with sesame seeds and green onions. Serve hot with keto ranch or cucumber salad.