In a medium-sized skillet or wok over medium-high heat, add 2 tablespoons vegetable oil. Add 1 chopped red bell pepper and 1 chopped green bell pepper and cook for 1-2 minutes until tender. Remove and set aside on a plate.
Turn the heat to high and add 1 ½ pounds sliced flank steak. Brown the beef for about 2 minutes. Reduce the heat to medium-high and continue to cook until no longer pink, about 3 minutes.
In a small bowl, whisk 3 cloves minced garlic, ¼ cup packed brown sugar , ½ cup soy sauce , 2 teaspoons sesame oil , 1 teaspoon ground ginger, and 1 tablespoon cornstarch.
Add the cooked peppers back to the skillet, then pour in the sauce. Continue to cook for 1-2 minutes until the sauce starts to thicken. Serve over rice.
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Notes
Storage & Reheating Instructions
Refrigerator: Store leftovers in an airtight container for up to 5 days.
Reheating: Reheat in the microwave or on the stovetop until heated through.
Freezer: Freeze leftovers in a freezer-safe airtight container for up to 3 months.