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1
Using fork, mix butter, all chopped herbs, chipotle chiles, and crushed coriander in small bowl. Season to taste with salt and pepper. DO AHEAD:
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2
Position rack in bottom third of oven and preheat to 400u00b0F. Place chicken, breast side up, in large roasting pan; place reserved neck, heart, and gizzard alongside. Starting at neck end of chicken, slide fingers under skin to loosen, being careful to avoid tearing. Spread all but 1 tablespoon seasoned butter over breast meat and thigh meat under skin.Rub any butter remaining on fingers over outside of chicken. Sprinkle main cavity of chicken with salt and pepper; place all herb sprigs in cavity. Tie legs together loosely.
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3
Place onion wedges in large bowl. Melt remaining 1 tablespoon seasoned butter in small saucepan over low heat; pour over onion wedges and toss to coat. Arrange onions around chicken. Sprinkle onions and chicken with salt and pepper.
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4
Roast chicken and onions 30 minutes. Scatter garlic cloves around chicken; add 1/4 cup broth to roasting pan. Continue to roast chicken until instant-read thermometer inserted into thickest part of thigh registers 170u00b0F, basting occasionally with pan juices and adding more broth by 1/4 cupfuls as needed to maintain juices in roasting pan, about 1 hour 15 minutes.
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5
Remove roasting pan from oven. Tilt chicken, draining juices from cavity into pan. Transfer chicken, onions, and garlic to platter. Tent with foil to keep warm. Add 1/4 cup broth and wine to pan. Place over 2 burners and bring juices to boil, scraping up browned bits. Strain juices into bowl. Discard fat from top of juices.
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6
Cut meat from chicken (reserve 1 1/3 cups for tostadas). Serve, making tacos with warm tortillas, chicken, onions, garlic, and avocado. Drizzle tacos with pan juices.
