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Export 12 ingredients for grocery delivery
Heat 1 1/2 tablespoons of the vegetable oil in a large pan over high heat. Place the steak in a medium sized bowl with the cornstarch and salt and pepper to taste. Toss gently to combine..
Place the meat in a single layer in the pan. Cook for 2-3 minutes per side until golden brown. You may have to do this step in batches.
Remove the steak from the pan. Cover with foil to keep warm.
Pour the remaining vegetable oil into the pan. Add the onion and both types of bell peppers. Cook for 4-5 minutes or until vegetables are softened.
Add the garlic to the pan; cook for an additional 30 seconds. Return the beef to the pan. Stir in the peanuts and chilies.
While the meat and vegetables are cooking, make the sauce. Place all of the ingredients in a small bowl and whisk until combined.
Add the sauce to the steak mixture and bring to a boil; cook for 1 minute, or until sauce is just thickened. Serve immediately.