Step 1Combine, black bean garlic sauce, oyster sauce and sugar and set aside.
Step 2Heat oil in skillet over medium-high heat and saute garlic until light brown, about 2 minutes. Stir in red and green bell peppers, white onion and green onions. Cook until white onions start to turn translucent, 1 minute.
Step 3Add chicken and cook until no longer pink, stirring occasionally, about 3 to 4 minutes. Add black bean garlic sauce mixture and pepper and mix well. Cook until chicken is cooked through, about 3 to 4 more minutes. Garnish with chopped green onions.