Step 1

Arrange two racks on the top third and bottom third of the oven. Heat the oven to 425 degrees.

Step 2

Cut the eggplants lengthwise into 1/2-inch-thick slices. Salt both sides and let sit across two sheet pans to sweat for 10 minutes.

Step 3

Prepare a breading station with three wide, shallow bowls. Add the flour to one bowl, the eggs to another and the panko to the third. Pat the eggplant slices dry, dip each in the flour, then the beaten eggs and finally the panko, really packing on the bread crumbs with your hands.

Step 4

Generously grease the two sheet pans with olive oil and place the breaded eggplant in a single layer across both pans. Bake until crispy, switching the positions of the pans halfway through, about 30 minutes.

Step 5

Meanwhile, to a large saucepan, add the marinara sauce and a sprig of basil. Fill one of the empty marinara sauce jars with 1/2 cup water, swish around, then pour into the second jar and swish again; pour this tomatoey water into the saucepan. Bring to a simmer over medium-high and cook, stirring constantly, until heated through, about 5 minutes. Taste and add salt if desired.

Step 6

Grease a 9-by-13-inch baking pan or casserole dish (and set it on a sheet pan, if desired, to catch any potential spillover). Put down half of the baked eggplant in a single layer, cutting any pieces to make them fit. Cover with half of the sauce (about 2 1/2 cups). Then, sprinkle over half of the mozzarella, followed by half of the Parmesan. Add a few basil leaves over the top. Top with another layer of the remaining eggplant, followed by the remaining sauce, then the remaining mozzarella and Parmesan. Bake on the bottom rack, uncovered, until browned on top and bubbly at the edges, 25 to 30 minutes.

Step 7

For clean slices and distinct layers, let the pan cool for at least 30 minutes before cutting into it. Before serving, top with more basil leaves.