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Preheat oven to 350F. Spray an 8x8-inch dish with cooking spray.
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To make the sauce, whisk together chicken broth, hoisin, ginger, cornstarch, red pepper, and black pepper in a small bowl. Set aside.
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Lightly coat a large skillet with cooking spray and heat over medium heat. Add chicken and cook until browned, turning once. Remove to a plate; add onion, celery, carrots, and pepper to the skillet. Cook until the veggies have softened; add garlic and cook another 30 seconds, until the garlic is fragrant. Stir in sauce and cook until sauce has thickened, about 3 minutes. Stir in chicken and rice.
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Transfer the mixture to the prepared dish and bake for 15 minutes or until bubbly. Sprinkle chow mein noodles and cashews and bake another 5 minutes. Sprinkle with green onions before serving.