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Preheat oven to 450°.
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Heat a large skillet over medium-high heat.
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Combine 1/2 teaspoon salt, fennel seeds, 1/4 teaspoon black pepper, garlic powder, and oregano.
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Brush chicken with 1 1/2 teaspoons oil; sprinkle spice rub over chicken.
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Add 1 1/2 teaspoons oil to pan.
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Add chicken; cook 3 minutes or until browned. Turn chicken over; cook 1 minute.
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Arrange chicken in an 11 x 7–inch baking dish coated with cooking spray. Bake at 450° for 10-20 minutes or until done.
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Heat remaining olive oil over medium-high heat.
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Add bell peppers, onion, and rosemary; sauté 3 minutes.
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Stir in broth, scraping pan to loosen browned bits. Reduce heat; simmer 5 minutes.
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Increase heat to medium-high. Stir in vinegar, 1/4 teaspoon salt, and 1/4 teaspoon pepper; cook 3 minutes, stirring frequently.
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Serve bell pepper mixture over chicken.