Preheat your oven to 400 degrees F and line a large baking sheet with parchment paper.
Arrange the cauliflower florets in a single layer on the prepared tray.
Spray the florets generously with cooking oil spray. Sprinkle with garlic salt, plus extra salt and pepper to taste. Use your hands to toss the cauliflower until every piece is evenly coated.
Bake for 15 to 20 minutes, or until the edges of the cauliflower begin to turn golden brown and tender.
While the cauliflower roasts, prepare the sauce. Combine honey, minced garlic, soy sauce, Sriracha, hoisin, and cornstarch in a small saucepan. Whisk until the cornstarch is fully incorporated.
Place the saucepan over medium heat. Stir frequently for 4 to 5 minutes until the sauce thickens into a sticky glaze.
Remove the cauliflower from the oven and let it cool for two minutes.
Transfer the florets to a large bowl, pour the warm sauce over them, and toss until fully coated.
Garnish with sliced green onions and sesame seeds before serving warm.