In A Skillet, Saute Onion, Green Pepper, Thyme And 1/2 Teaspoon Garlic Powder In Oil Until Vegetables Are Crisp-Tender. Meanwhile, Sprinkle Steak With Remaining Garlic Powder. Grill Or Broil Steak 5 Inches From The Heat For 6 To 8 Minutes (For Medium-Rare), Turning Once, Or Until Desired Doneness Is Reached. Add Tomatoes To Skillet. Combine Reserved Tomato Juice And Cornstarch; Add To Vegetable Mixture. Cook And Stir Until Thickened. Season To Taste With Salt And Pepper. Thinly Slice Meat; Top With Vegetables.