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Preheat oven to 400°F (200°C). Line a large sheet pan with parchment paper or foil for easy cleanup.
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Cut the sausage into rounds, halve the potatoes, chop the broccoli, slice the peppers, and cut the zucchini and onion.
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Toss all vegetables and sausage with olive oil, garlic powder, smoked paprika, Italian seasoning, salt, and pepper until everything is well coated.
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Arrange everything in a single layer on the sheet pan. Don't overcrowd — use two pans if needed. Keep potatoes and sausage toward the hotter edges.
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Roast for 25-30 minutes, flipping everything once halfway through. Potatoes should be golden and fork-tender, sausage should have crispy edges, and broccoli should be slightly charred at the tips.
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Let cool for a minute (the pan is hot!), then serve straight from the tray. Put out dipping sauces — ketchup, ranch, or nothing at all.