Best Ever Pepper Steak - Easy and Delicious - My Homemade Recipe

Ingredients

• 1.5 lbs flank steak, thinly sliced.
• 1/4 cup soy sauce.
• 2 tablespoons oyster sauce.
• 1 tablespoon cornstarch.
• 1 tablespoon brown sugar.
• 2 tablespoons vegetable oil.
• 1 onion, thinly sliced.
• 1 red bell pepper, sliced.
• 1 green bell pepper, sliced.
• 3 cloves garlic, minced.
• 1 teaspoon fresh ginger, grated.
• Salt and black pepper to taste.
• 2 green onions, sliced (for garnish).