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Heat the oven to 400°F. Place the tomatillos on a sheet pan and drizzles with 1 tablespoon of the oil and a sprinkle of salt. Transfer to the oven and cook until tomatillos are soft and slightly roasted, 8 to 10 minutes.
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Remove from the heat and let cool slightly. Then finely chop and set aside.
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In a medium sauce pot over high heat, warm the remaining olive oil. Add the onion and a pinch of salt and cook until starting to soften, 4 to 6 minutes. Stir in the spices and jalapeno and cook until fragrant, 1 to 2 minutes.
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Add the broth, chopped tomatillos and 1 cup of water. Bring to a boil, then reduce to a simmer. Cook, stirring occasionally, until slightly thickened, 3 to 4 minutes.
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Stir in the shredded chicken and continue simmering until the sauce is the consistency of a thick stew, 6 to 8 minutes. Slice the lime in half. Juice one half and cut the other half into wedges.
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Remove the stew from the heat, stir in the lime juice and season to taste with salt and pepper.
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Serve in bowls. Garnish with the pumpkin seeds, cilantro, and jicama, if using.