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Preheat oven to 425°F (220°C).
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Toss potatoes with olive oil, salt, pepper, and seasoning.
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Roast for 25–30 minutes, flipping halfway.
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Cook brats on grill or stovetop until fully cooked (about 15 minutes).
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Sauté or steam green beans until tender, then toss with sliced red onion.
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Serve everything warm.