Preheat oven to 350°F (180°C). Toast cashews 12–14 minutes until golden. Cool and set aside.
Heat sesame oil in a Dutch oven. Sauté onions 2 minutes.
Add mushrooms, cook 2 minutes.
Add bell peppers, cook 2 minutes more.
Stir in garlic, ginger, and chili flakes; cook 1 minute.
Stir in 2 tablespoons tamari, liquid aminos, and brown sugar. Add chilled rice.
Stir-fry 4–5 minutes until coated. Add water if needed to deglaze.
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