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Preheat the oven to 450F.
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Pat chicken dry. Season with salt and pepper. Melt butter over medium-high heat in a large skillet. Sear chicken until brown on both sides, 4-5 minutes on each side.
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Meanwhile, prepare vegetables. Toss quartered mushrooms, zucchini, and carrot in a large bowl with the garlic and rosemary.
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Spread veggies out onto a large baking sheet. Nestle chicken into the veggies. Drizzle with butter and juices from the pan.
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Bake for 20 minutes, or until chicken is cooked through and veggies are tender.
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For the orzo:
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Warm the broth in a small pot over medium-low heat.
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Use the skillet from the chicken and add additional butter and olive oil over medium heat. Add onion, garlic, and minced mushrooms. Cook, stirring occasionally, until onions soften, 3-4 minutes.
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Add, orzo and black pepper. Stir and cook the orzo for 2 minutes. Add the white wine and cook until evaporated, about 1 minute.
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Add broth to the orzo, 2/3 cup at a time, stirring until the liquid is absorbed. Repeat with remaining broth, waiting until the last batch is absorbed before adding the next.
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Remove from heat and stir in parmesan.