Preheat oven to 425°F (218°C).
Line a baking sheet with parchment paper.
Wash and cut cauliflower into bite-sized florets.
Make the Batter
In a large bowl, whisk together flour, milk, garlic powder, paprika, salt, and black pepper until smooth.
Coat and Bake
Dip cauliflower florets into the batter and allow excess batter to drip off.
Arrange cauliflower evenly on prepared baking sheet.
Bake for 25–30 minutes, flipping halfway through, until golden and crispy.
Prepare the Orange Sauce
In a saucepan, combine orange juice, soy sauce, honey, garlic, and ginger.
Bring to a gentle simmer over medium heat.
In a small bowl, mix cornstarch and water.
Stir cornstarch mixture into the sauce and cook until thickened.
Add red pepper flakes if desired.
Toss and Serve
Transfer baked cauliflower to a large bowl.
Pour orange sauce over cauliflower and toss gently until coated.
Garnish with sesame seeds, green onions, or orange zest if desired.
Serve immediately.