In a small mixing bowl, whisk together 1/2 cup water, 2 tablespoons soy sauce, 2 tablespoons chili garlic sauce, 2 tablespoons minced garlic, 1 tablespoon grated ginger, 2 teaspoons cornstarch, 1 teaspoon honey, and 1/2 teaspoon crushed red pepper flakes. Set aside.
Cube 2 pounds boneless skinless chicken breasts and place the cubed chicken in a medium bowl. Add 1/4 cup cornstarch, along with 1/4 teaspoon salt and 1/4 teaspoon black pepper. Toss the chicken until well coated.
Heat a wok or large skillet over high heat. Add 2 tablespoon vegetable oil and 2 tablespoons sesame oil. Once hot, add the coated chicken to the pan. Cook for about 5 minutes, tossing occasionally, until the chicken starts to brown.
Add the bell peppers, onion, and 2 tablespoons minced garlicto the wok with the chicken. Cook for another 5 minutes, stirring frequently, until the vegetables begin to soften.
Reduce the heat to medium. Pour the sauce mixture into the wok, stirring to coat the chicken and vegetables evenly. Continue to cook for 8-10 minutes, stirring occasionally, until the sauce has thickened.
Remove from heat and serve the Szechuan chicken over steamed rice. Garnish with sliced green onions.