Preheat the oven to 400°F (200°C). Lightly drizzle oil directly on a baking sheet (or layer with foil first if desired).
Place the baking sheet in the oven while it’s preheating so that when the brussels sprouts are added to it, they’ll start to develop a nice crisp from the start (optional).
Trim the stem of each brussels sprout and slice in half lengthwise.
Add the halved sprouts to a large bowl, drizzle with oil, and add in spices. Use your hands or a spatula to mix everything until evenly coated.
Place the halved brussels sprouts in a single layer on the hot baking tray, cut side down.
Bake for 15 minutes, mix with a wooden spoon, and bake for another 5-8 minutes until the sprouts become golden brown and crispy.
While the sprouts are baking, mix together all of the sauce ingredients.
Heat up neutral oil in a large saucepan and add garlic. Cook garlic for 2 minutes before adding in the sauce. Simmer for 3-4 minutes or until it thickens.
Add the roasted brussels sprouts to the sauce and stir until each piece is evenly coated.
Serve in a large plate or bowl and garnish with chopped scallions and sesame seeds!