Preheat your oven to 400°F.
Heat 1 tablespoon of olive oil in a large skillet over medium heat. Add the sausage links whole. Cook for 3-4 minutes per side until the outside is deeply browned all over. You are not cooking them through yet, just building color on the outside.
Remove the sausage from the skillet and let it rest for a couple of minutes. Slice into 1-inch rounds and set aside.
Add the sliced bell peppers, onion, and quartered potatoes to a 9x13 inch baking dish. Drizzle with the remaining 2 tablespoons of olive oil and the red wine vinegar. Add the garlic powder, salt, pepper, and oregano. Toss everything together until evenly coated.
Nestle the sausage slices into the baking dish among the vegetables. Spread everything into an even layer so nothing is stacked.
Bake for 45 minutes, or until the potatoes are fork tender and the edges are golden. Stir once halfway through so everything cooks evenly.
Serve straight from the baking dish.