Heat large nonstick skillet over medium heat until hot. Add Ground Beef and bell pepper; cook 8 to 10 minutes, breaking into 3/4-inch crumbles and stirring occasionally. Remove from heat. Pour off drippings.
Add lettuce, cheese, dressing and olives to beef mixture; toss to combine. Top pitas with equal amounts of beef mixture.
Nutrition information per serving: 505 Calories; 216 kcal Calories from fat; 24 g Total Fat; 8 g Saturated Fat; 8 g Monounsaturated Fat; 81 mg Cholesterol; 843 mg Sodium; 39 g Total Carbohydrate; 3.6 g Dietary Fiber; 31 g Protein; 4.7 mg Iron; 8.3 mg Niacin; 0.5 mg Vitamin B6; 2.4 mcg Vitamin B12; 3.2 mg Zinc; 35.1 mcg Selenium;