Step 1: Prepare the Zucchini - Wash the zucchini thoroughly and trim off both ends. Slice the zucchini lengthwise into ¼-inch thick strips, creating long planks. Pat them dry with paper towels to remove excess moisture, which helps achieve better browning.

Step 2: Sauté the Zucchini - Heat olive oil in a large oven-safe skillet over medium-high heat. Add the zucchini slices in a single layer (work in batches if needed). Cook for 3-4 minutes per side until golden brown and tender-crisp. Season with salt and pepper while cooking.

Step 3: Add Aromatics - Reduce heat to medium and add minced garlic to the skillet. Sauté for 30 seconds until fragrant, being careful not to burn it. Sprinkle Italian seasoning over the zucchini.

Step 4: Layer the Toppings - Arrange the sautéed zucchini in an even layer in your oven-safe skillet or transfer to a baking dish. Scatter the diced tomatoes evenly over the zucchini. Combine mozzarella, provolone, and parmesan cheeses, then distribute the cheese mixture generously over the top.

Step 5: Broil to Perfection - Preheat your broiler to high. Place the skillet or baking dish under the broiler, about 6 inches from the heat source. Broil for 3-5 minutes, watching carefully, until the cheese is melted, bubbly, and golden brown in spots.

Step 6: Garnish and Serve - Remove from the oven and immediately sprinkle fresh chopped basil over the top. Add red pepper flakes if desired. Let rest for 2-3 minutes before serving to allow the cheese to set slightly.