Step 1: Prepare the Matzo

• Preheat your oven to 375°F (190°C).
• In a large bowl, break the matzo sheets into small pieces.
• Pour hot water over the matzo and let it soak for about 2 minutes, until softened.
• Drain the softened matzo and set aside.

Step 2: Prepare the Filling

• Heat a drizzle of olive oil in a skillet over medium heat.
• Add the chopped onion and minced garlic, sautéing until softened and fragrant, about 3-4 minutes.
• Add the chopped spinach to the skillet and cook until wilted, about 2-3 minutes.
• Remove the skillet from heat and let the mixture cool slightly.

Step 3: Mix the Filling

• In a large mixing bowl, combine the softened matzo, cooked spinach mixture, ricotta cheese, shredded mozzarella cheese, grated Parmesan cheese, eggs, milk, salt, and pepper.
• Mix everything until well combined.

Step 4: Assemble and Bake the Pie

• Grease a 9×13-inch baking dish with olive oil.
• Pour the spinach and cheese mixture into the prepared baking dish, spreading it out evenly.
• Bake in the preheated oven for 35-40 minutes, or until the top is golden brown and the filling is set.
• Remove from the oven and let it cool slightly before slicing and serving.