Heat oven to 400°F for dark or nonstick pan (425°F for all other pans). Spray 15x10-inch pan with sides with cooking spray.
Unroll dough in pan; starting at center, press dough into 15x10-inch rectangle. Bake 13 to 18 minutes or until edges of crust are golden brown.
In small bowl, stir Greek seasoning into cream cheese; spread over crust. Top with spinach, onion and olives. Serve immediately, or cover and refrigerate 1 to 2 hours before serving. To serve, cut into 6 rows by 4 rows. Top each piece with tomato.