In a small bowl, whisk together honey, soy sauce, rice vinegar, sriracha, sesame oil, and cornstarch. Set aside.
Cut chicken breasts into 1/2-inch pieces. Season with salt, black pepper, and garlic powder. Toss chicken in the cornstarch mixture until coated.
Heat cooking oil in a skillet over medium-high heat. Cook half the chicken until browned, about 3-4 minutes. Remove and repeat with remaining chicken.
In the same skillet, add butter and lower heat. Add minced garlic and sauté until fragrant, about 30-60 seconds.
Pour the sauce into the skillet with garlic. Simmer for 2 minutes until thickened.
Return chicken to the skillet and stir to coat in sauce. Cook for 1-2 more minutes until heated through.
Remove from heat, garnish with green onions, and serve immediately!