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Gather all ingredients.
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Heat oil in a large non-stick skillet over medium-high until shimmery, about 2 minutes. Meanwhile, stir together chicken and 1 tablespoon of cornstarch in a medium bowl until chicken is coated.
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Add chicken to skillet in a single layer and cook, stirring often, until crisp and cooked through, about 6 minutes. Add onions, and cook, stirring often, until translucent, about 1 minute. Add ginger and garlic; cook, stirring constantly, until fragrant, about 1 minute. Transfer chicken mixture to a plate and set aside.
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Add broccoli to empty skillet, and cook over medium-high, stirring occasionally, until bright green and heated through, 2 to 3 minutes.
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Meanwhile, whisk together water, soy sauce, oyster sauce, brown sugar, crushed red pepper, black pepper, and remaining 2 tablespoons cornstarch in a small bowl until smooth, about 30 seconds.
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Add cooked chicken mixture to broccoli in skillet; add soy sauce mixture and cook, stirring constantly, until broccoli and chicken are well coated, and sauce thickens, about 2 minutes.
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Serve immediately. Enjoy!