Preheat oven to 350ºF.
Dice tomatoes into small pieces. Transfer to a mixing bowl.
To tomatoes add chopped garlic, salt, pepper, 1/2 of chopped basil (about 1/4 cup), and 4 tablespoons olive oil. Set aside and allow mixture to marinate for about 10 minutes.
Flatten pizza dough into rectangle pan as indicated on package, reaching to pan edges. Drizzle dough with olive oil and brush it over dough.
Bake dough at 350ºF for 10 minutes on center rack. Remove from oven and allow to cool slightly, about 2 minutes.
Cut garlic clove in half and rub, cut side down, onto the surface of the bread. The slight warmth of the bread will help extract the garlic flavor. Allow bread to cool completely, about 10 more minutes.
Increase oven temperature to 450ºF.
In a small mixing bowl, combine mayonnaise and garlic powder. Evenly spread mixture onto the bread’s surface.
Top with shredded mozzarella to evenly cover surface.
Drain tomato mixture. Spread evenly over the bread.
Sprinkle with grated Parmesan cheese.
Return flatbread to oven for 5 - 7 more minutes or until golden, crisp and bubbly.
Garnish with remaining chopped basil and serve.