01 - Preheat oven to 425°F and line a large baking sheet with parchment paper.
02 - In a mixing bowl, whisk together flour, water, garlic powder, salt, and black pepper until a smooth batter forms.
03 - Dip each cauliflower floret into the batter, allowing excess to drain. Evenly coat with panko breadcrumbs.
04 - Arrange coated florets on the prepared baking sheet in a single layer. Bake for 25–30 minutes, flipping midway, until golden and crisp.
05 - Combine honey, soy sauce, minced garlic, and rice vinegar in a saucepan over medium heat. Bring to a simmer.
06 - Stir in cornstarch slurry and cook, whisking, until sauce thickens, about 1–2 minutes. Remove from heat.
07 - Toss hot baked cauliflower in the honey garlic sauce until thoroughly coated.
08 - Transfer to a serving plate and garnish with sliced green onions and sesame seeds.