In a gallon-size plastic bag, combine flour, salt, and pepper. Add chicken, seal bag, and shake well to coat.

Coat a large nonstick skillet with nonstick spray and warm over medium-high heat. Add chicken to skilllet and cook, stirring, for 3 to 4 minute, or until no longer pink. Transfer to a plate.

Reduce heat to medium. Combine soy sauce and sugar in skillet. Cook, stirring occasionally, until the sugar dissolves, about 1 to 2 minutes max. Add oil and sesame seeds. Add chicken and scallion. Toss and serve immediately.

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