Follow these simple steps to create Roasted Cabbage Wedges with Onion Dijon Sauce:

1. Preheat Oven: Preheat your oven to 400°F (200°C).
2. Prepare Cabbage: Remove the outer leaves of the cabbage. Cut it into wedges, keeping the core intact to hold the wedges together.
3. Season the Cabbage: Place the cabbage wedges on a baking sheet. Drizzle with olive oil, and sprinkle with salt, pepper, and garlic powder. Toss gently to coat.
4. Roast the Cabbage: Roast in the preheated oven for 25–35 minutes, flipping halfway through, until the edges are crisp and the cabbage is tender.
5. Make the Sauce: While the cabbage roasts, combine sour cream, Dijon mustard, finely chopped onion, and lemon juice in a mixing bowl. Stir until smooth and well blended.
6. Check Cabbage: Once the cabbage is a beautiful golden brown and fork-tender, remove it from the oven.
7. Serve: Arrange the roasted cabbage wedges on a serving platter and drizzle the Onion Dijon Sauce over the top. Garnish with freshly chopped herbs for a pop of color and flavor.

These steps will guide you effortlessly in preparing this incredible side dish.