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Set the Instant Pot to saute. Season the chicken well with salt and pepper on both sides.
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Once the Instant Pot is hot, add the chicken breast and sear each side for about 3 minutes. Then press “cancel” to turn off the heat.
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Add the rice, carrots, celery, onion, chicken broth, thyme, sage, and red pepper flakes to the Instant Pot.
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Seal and set the Instant Pot to manual, high pressure, for 15 minutes. Once the time is up, natural release for 10 minutes, then quick release until Instant Pot depressurizes.
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While Instant Pot is cooking, preheat the oven to 425 degrees F.
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On a large sheet pan, toss together the mushrooms, olive oil, rosemary, garlic, and salt and pepper to taste. Roast mushrooms for 25 - 30 minutes.
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Remove mushrooms from the oven and mash the garlic cloves.
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Blend together cashews and ½ cup water until smooth.
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Switch the Instant Pot back to Saute mode, stir in mashed garlic, blended cashew, chopped kale, and nutritional yeast. Cook until kale becomes slightly wilted.
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Spoon soup into a bowl and top with roasted mushrooms before serving.