Heat oven to 350°F. Heat large nonstick skillet over medium heat until hot. Add Ground Beef, onion and garlic in large nonstick skillet over medium heat 8 to 10 minutes, breaking into small crumbles and stirring occasionally. Add tomato, oregano, salt and pepper; cook and stir 1 to 2 minutes or until mixture is heated through.
Place phyllo shells on rimmed baking sheet. Spoon beef mixture evenly into shells. Top evenly with cheese. Bake 9 to 10 minutes or until shells are crisp and cheese is melted.
Meanwhile combine Cucumber-Yogurt Sauce ingredients in small bowl. Season with salt and pepper, as desired. Cover and refrigerate until ready to use.
Top tarts with Cucumber-Yogurt Sauce, olives and hummus, as desired.
Nutrition information per serving: 48 Calories; 17.1 kcal Calories from fat; 1.9 g Total Fat; 0.9 g Saturated Fat; 0 g Trans Fat; 0.1 g Polyunsaturated Fat; 0.7 g Monounsaturated Fat; 14 mg Cholesterol; 75 mg Sodium; 3.1 g Total Carbohydrate; 0.2 g Dietary Fiber; 4.4 g Protein; 0.6 mg Iron; 84 mg Potassium; 1.1 mg Niacin; 0.1 mg Vitamin B6; 0.5 mcg Vitamin B12; 1 mg Zinc; 4.3 mcg Selenium; 14.6 mg Choline;