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1
To prepare chicken, heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add lemon to pan; saute 5 minutes or until lightly browned, turning occasionally. Remove from pan; cool.
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2
Preheat oven to 400u00b0.
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3
Remove and discard giblets from chicken; trim excess fat. Starting at neck cavity, loosen skin from breast and drumsticks by inserting fingers, gently pushing between skin and meat. Combine 1/4 teaspoon salt and 1/4 teaspoon pepper; rub salt mixture under loosened skin. Insert lemon slices in a single layer under loosened skin. Place rosemary inside body cavity. Lift wing tips up and over back; tuck under chicken. Place chicken on a roasting pan coated with cooking spray. Lightly coat chicken with cooking spray. Remove white papery skin from garlic head (do not peel or separate cloves). Place garlic head in pan.
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4
Bake at 400u00b0 for 15 minutes. Reduce oven temperature to 350u00b0 (do not remove chicken from oven); bake an additional 1 hour or until a thermometer inserted in the meaty part of thigh registers 165u00b0. Remove chicken from pan; let stand 10 minutes. Remove skin; discard. Loosely cover chicken; keep warm.
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5
Remove garlic from pan; set aside. Place a zip-top plastic bag inside a 2-cup glass measure. Pour drippings into bag; let stand 10 minutes (fat will rise to the top). Seal bag; carefully snip off 1 bottom corner of bag. Drain drippings back into pan, stopping before fat layer reaches opening; discard fat.
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6
Separate garlic cloves; squeeze to extract pulp. Place pan over medium-high heat. Stir in garlic pulp, wine, and broth; bring to a boil, scraping pan to loosen browned bits. Cook 10 minutes or until sauce is slightly thick. Remove from heat; stir in butter.
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7
To prepare potatoes, place potatoes in a saucepan; cover with water. Bring to a boil. Reduce heat, and simmer 20 minutes or until very tender; drain. Return potatoes to pan. Mash with a potato masher to desired consistency. Add milk and remaining ingredients; stir until combined. Serve chicken with gravy and potatoes.