1Heat oven to 400°F. Grease large cookie sheet with shortening or cooking spray. Unroll pizza crust; press into 12x8-inch rectangle on cookie sheet. With end of handle of wooden spoon, press indentations in top of dough, about 1 inch apart. Brush dough with oil; sprinkle with garlic powder, Italian seasoning and Parmesan cheese.
2Bake 10 to 13 minutes or until golden brown. Cool 30 minutes.
3Cut focaccia in half lengthwise to make 2 (12x4-inch) pieces. Spread bottom of each focaccia piece with 1/4 cup dip. Top 1 piece with single layer of tomatoes and the spinach. Layer turkey evenly over spinach. Place remaining focaccia piece, dip side down, over turkey; press lightly.
4With long serrated knife, cut into 6 rows crosswise by 2 rows lengthwise to make 12 square sandwiches. Secure each sandwich through all layers with toothpick.