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Preheat the oven to 400F.
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Slice all the veggies into uniformly thin slices with a knife or mandoline. In a bowl, toss them with the oil, salt, and pepper until evenly coated.
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Spread out on baking pan(s) lined with parchment paper, minimizing overlap. Bake for 10 minutes at 400F. Flip. Bake for another 5-10 minutes until crispy and slightly brown but not burnt. Watch them carefully and even remove some early if they are browning before the others.
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Remove from the oven and allow to cool for a few minutes before eating.