Heat oven to 350 degrees.
Roll out pie crust into pie pan. Flute the edges.
Lightly drizzle the olive oil over the crust. Lay tomatoes over crust in a circle. Lay mozzarella alternating the tomatoes. Place the basil leaves in a star shape over the tomatoes and cheese. Sprinkle with salt and pepper.
In a bowl, beat eggs and half and half until well mixed. Carefully pour the egg mixture into the crust.
Bake for 50-55 minutes, until the crust is browned and the filling is set. The tomatoes and basil will rise to the top.
Remove from the oven and cool on a wire rack for 10 minutes.
If desired, drizzle the plated quiche with balsamic.