Heat oven to 425°F. Spray 15x10x1-inch baking pan with nonstick cooking spray; sprinkle evenly with cornmeal. Unroll dough; place in greased pan. Starting at center, press out dough with hands. Brush with 2 tablespoons oil; sprinkle with 1/2 to 1 teaspoon garlic powder. Bake at 425°F. for 7 to 9 minutes or until light golden brown.
Meanwhile, in blender container or food processor bowl with metal blade, combine all filling ingredients. Blend 1 to 2 minutes or until smooth.
Spread filling over partially baked crust. Top with tomatoes, olives and cheese. Return to oven; bake at 425°F. for an additional 10 to 12 minutes or until edges of crust are golden brown.