Heat oven to 400°F. Spray 18 regular-size muffin cups with cooking spray. Place 1 wonton skin in each muffin cup, pressing down slightly. Bake 8 minutes or until golden brown.
Meanwhile, cook macaroni and cheese as directed on package; keep warm.
In 12-inch skillet, cook beef, onion and bell pepper over medium-high heat 5 to 7 minutes, stirring occasionally, until beef is thoroughly cooked; drain. Stir in taco seasoning mix and water. Add macaroni and cheese; mix well. Spoon 1/4 cup taco mixture into each wonton cup. Sprinkle evenly with cheese.
Bake 2 minutes or until cheese is melted. Cool 5 minutes. Remove from pan. Top each taco cup with sour cream, green onions and olives. Serve warm.