Preheat your oven to 375°F (190°C). Place the tart shell on a baking sheet lined with parchment paper to keep it steady and prevent sticking.
Slice the heirloom tomatoes into thick 1/2-inch slices, ensuring they hold their shape. Set aside.
Gently layer the tomato slices inside the tart shell, starting from the outer edge and working inward, overlapping them slightly for a colorful, layered look. Press down softly to settle the slices and encourage juices to bead at the edges.
Sprinkle the chopped fresh basil evenly over the tomatoes, then crumble the feta or goat cheese on top for a tangy, creamy contrast.
Drizzle the olive oil evenly over the layered ingredients, then season generously with salt and freshly cracked black pepper to enhance the flavors.
Place the assembled tart into the preheated oven and bake for about 25 minutes, or until the crust edges turn golden amber and the tomatoes are bubbling slightly.
Once baked, remove the tart from the oven and let it cool for a few minutes. Optionally, drizzle with a few drops of aged balsamic vinegar for a touch of sweetness and depth.
Slice the tart into portions and serve slightly warm, enjoying the crisp crust, juicy tomatoes, and fresh basil with every bite.
