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Combine flour and pepper in large Ziploc bag. Add chicken. Shake to coat with flour mixture.
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Heat oil in skillet over medium-high heat. Brown chicken about 2 minutes on each side.
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Place chicken in slow cooker.
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Combine soy sauce, vinegar, ketchup, sugar, garlic, ginger, and pepper flakes in small bowl; pour over chicken.
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Cook on low 4 - 5 hours. Add cashews and stir. Serve over rice.