How to Make It
Preheat oven to 450°F.
Combine flour, milk, garlic powder, salt, and black pepper in a large bowl; stir with a whisk. Add cauliflower; toss to coat.
Arrange cauliflower on a foil-lined rimmed baking sheet coated with cooking spray. Bake at 450°F for 20 minutes, gently tossing once halfway through.
Combine maple syrup, tamari, oil, vinegar, and ginger in a small bowl; stir with a whisk. Pour maple-sesame mixture over cauliflower; toss to coat. Bake for an additional 5 minutes. Sprinkle sesame seeds and green onion overtop.