Step 1Combine chile garlic sauce, oyster sauce and vinegar and set aside.
Step 2Heat oil in medium saute pan over medium-high heat. Add garlic and saute until light brown, 2 to 3 minutes. Add cashews, dried peppers, red and green bell peppers and onion and stir-fry until onion starts to turn translucent, 3 minutes.
Step 3Add shrimp, stirring occasionally until they begin to turn pink. Add chile garlic sauce mixture and pepper, stirring to combine. Cook until shrimp are no longer pink and are cooked through, 2 to 3 minutes. Take care not to overcook shrimp or they'll be tough and chewy. Garnish with green onions.