Heat a large skillet over high heat. Combine steak and 1 teaspoon oil in a large bowl; toss to coat. Sprinkle steak with 1/4 teaspoon salt and 1/4 teaspoon pepper. Add steak to pan; cook for 2 minutes or until browned, stirring occasionally. Remove steak from pan.
Reduce heat to medium-high. Add remaining 1 tablespoon oil to pan, and swirl to coat. Add garlic, and sauté for 30 seconds. Add oregano, remaining 1/4 teaspoon salt, remaining 1/4 teaspoon pepper, and tomatoes. Reduce heat, and simmer 6 minutes, mashing tomato mixture with a potato masher. Return steak to pan, and toss to coat.
Place bread on a baking sheet; broil 1 minute or until lightly toasted. Spoon tomato mixture evenly over bread slices; sprinkle evenly with cheese. Broil 2 minutes or until cheese begins to brown. Sprinkle with basil.