01 -
Lay zucchini slices on paper towels in a single layer. Sprinkle with kosher salt and let sit 15 to 20 minutes. Pat thoroughly dry with fresh paper towels before assembling.
02 -
Combine ricotta, egg, minced garlic, chopped basil, Italian seasoning, black pepper, and red pepper flakes if using. Stir until smooth. Taste and adjust seasoning.
03 -
Heat the oven to 375 degrees F (190 degrees C). Lightly coat a 9x13 baking dish with olive oil.
04 -
Spread a thin layer of marinara on the bottom of the dish. Add half the zucchini slices in a single layer. Spread half the ricotta filling over them, then spoon on more marinara and scatter about a third of the mozzarella.
05 -
Lay the remaining zucchini slices, then spread the rest of the ricotta filling. Top with the remaining marinara, the rest of the mozzarella, and all of the Parmesan.
06 -
Cover tightly with aluminum foil. Bake for 30 minutes until the zucchini is tender and the sauce is bubbling at the edges.
07 -
Remove the foil and bake another 12 to 15 minutes until the cheese on top is golden in spots and the edges bubble vigorously.
08 -
Let the bake rest 10 minutes before slicing. Garnish with fresh basil and serve.