01 - Preheat oven to 425°F. Line a large baking sheet with parchment paper and lightly grease with cooking spray or oil.
02 - In a large bowl, whisk together flour, water, garlic powder, onion powder, salt, and black pepper to create a smooth batter.
03 - Place panko breadcrumbs in a separate shallow bowl for coating.
04 - Dip each cauliflower floret into the batter, allowing excess to drip off, then coat in panko breadcrumbs. Arrange florets in a single layer on the prepared baking sheet.
05 - Lightly spray tops with oil and bake for 25 to 30 minutes, flipping halfway, until golden and crispy.
06 - While cauliflower bakes, make the sauce: In a small saucepan, combine honey, soy sauce, minced garlic, rice vinegar, and sesame oil. Bring to a simmer over medium heat.
07 - In a small bowl, mix cornstarch and water to form a slurry. Stir into the simmering sauce and cook for 1 to 2 minutes until thickened. Remove from heat.
08 - When cauliflower is crisp, transfer to a large bowl. Pour warm honey garlic sauce over the florets and gently toss to coat evenly.
09 - Sprinkle with sesame seeds and sliced green onions. Serve immediately.