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In a medium bowl, mix together olive oil, lemon juice and zest, red pepper flakes, rosemary, sage, and garlic.
Using sharp kitchen shears or poultry shears, remove spine from chicken (reserve spine for stock or another use). Flatten chicken by placing it skin side up on a cutting board and applying firm pressure to the breastbone. Transfer to a baking dish, season all over with salt and pepper, add marinade, and rub all over chicken. Cover dish with plastic. Marinate, refrigerated, at least 30 minutes and up to overnight.
Preheat oven, along with all cooking equipment for whichever setup you're using, including skillets, foil-wrapped bricks, chicken press, barbell weight, et cetera (see the "Special Equipment" section below for more info), to 475°F (245°C).
Scrape marinade and minced aromatics off chicken as best you can. Using cooking spray or oil, grease the interior of the bottom skillet/roasting vessel. Lay chicken down in skillet, skin side up, arranging it so that it lies flat.
Using cooking spray or oil, grease the bottom of the top weight. (Depending on your setup, this could be one side of the foil-wrapped bricks, or the bottom of the second skillet or chicken-press weight.) Press the top weight down on the chicken, making sure it evenly covers it and is in contact with both the breast and the legs.
Transfer to oven and cook until thickest part of breast, close to bone, registers 150°F (66°C) on an instant-read thermometer, about 30 minutes.
Remove chicken from oven, remove top weight, and let rest 5 to 10 minutes. Carve and serve with lemon wedges, drizzling fresh olive oil over chicken at the table.