In a mixing bowl, combine sliced boneless chicken with egg white, cornstarch, salt, and black pepper. Toss until well-coated and marinate for 10-15 minutes.

Heat 1/4 inch of vegetable oil in a skillet over medium-high heat. Add marinated chicken in batches and fry for 4-6 minutes until golden and crispy.

In the same skillet, lower heat, add sesame oil, sauté garlic, ginger, and red chilies for 1-2 minutes. Add remaining sauce ingredients and simmer for 2-3 minutes.

Add fried chicken back into the skillet, tossing to coat in the sauce. Cook for 1 minute over low heat.

Transfer to a platter, garnish with green onions and sesame seeds. Serve with rice, noodles, or lettuce cups.