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1
Place the salt, coriander, sugar, and chipotle powder in a small bowl and stir to combine.
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2
Rub the mixture all over both sides of the chicken and place the thighs on a baking sheet.
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3
Set aside and let the chicken come to room temperature, about 50 minutes.
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4
Meanwhile, if youre using a wooden skewer, soak it in water for at least 30 minutes so it doesnt burn on the grill, and prepare the grill.
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5
Heat an outdoor grill to medium high (about 375 degrees F to 425 degrees F) and rub the grill grate with a towel dipped in vegetable oil.
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6
Have a pastry brush and a small bowl of oil ready.
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7
Thread the onion slices onto the skewer, leaving 1/4 inch of space in between the pieces.
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8
Brush the onion slices with oil.
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9
Place the skewer and the whole tomatillos on the grill, cover the grill, and cook until the onion pieces are slightly softened and charred, turning the skewer halfway through, and the tomatillos are charred on all sides, turning occasionally, about 10 minutes total.
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10
Remove everything to a large dish.
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11
Halfway through the tomatillo and onion cooking time, brush the cut sides of the avocado halves with oil, place them on the grill cut-side down, and cover the grill.
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12
Cook the avocado halves until slightly softened and grill marks appear, about 3 to 4 minutes.
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13
Remove to the dish with the tomatillos and onions and let cool.
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14
Meanwhile, grill the chicken.
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15
Rub the grill grate again with a towel dipped in oil.
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16
Place the chicken on the grill and cover the grill.
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17
Cook, flipping once, until a crust and grill marks have formed and an instant-read thermometer registers 160 degrees F, about 15 to 20 minutes total.
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18
Remove to a cutting board, tent with foil, and let rest while you finish the sauce.
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19
Using a spoon, scoop out the avocado flesh and place it in a blender.
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20
Remove the onion slices from the skewer and add to the blender.
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21
Add the tomatillos, cilantro, lime juice, garlic clove, chile, and measured salt and season to taste with pepper.
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22
Blend until just smooth, about 1 minute, scraping down the sides of the blender with a rubber spatula as needed.
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23
Taste and season with additional salt and pepper as needed.
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24
Serve with the chicken.
