Preheat the oven to 375°.: You should notice a steady, dry warmth building as the oven reaches 375 B0 , which creates the right environment for the cheese to melt without turning the matzo limp. The heat encourages the sauce to loosen slightly and mingle with the toppings, releasing a faint tomato aroma. If the oven is not fully preheated, the matzo may not crisp correctly and the cheese might take longer to melt, so be patient. A common mistake is rushing this step, which results in uneven baking and a tougher texture.
Place a rack on a baking sheet.: Positioning a rack on a baking sheet allows air to circulate and catches any stray juices, keeping the oven clean. You ll hear a faint rattle as the rack settles and feel the metal warm when you slide it in. This setup helps the underside of the matzo stay crisp while the top finishes, because the thin layer of air under the rack prevents steamy softening. If you skip the rack and set the matzo directly on a flat pan, moisture can accumulate and make the base soggy, so avoid that pitfall.
Spread 1 1/2 tablespoons of crushed tomatoes on each matzo.: The tomatoes should form a thin, even veil across the matzo , glistening slightly as you spread them with the back of a spoon. This thin layer warms quickly in the oven and deepens in flavor, releasing a warm, tangy scent as it heats. The reason for this exact amount is to prevent saturation of the cracker while still providing a satisfying tomatoy core. Overapplying sauce is a frequent error, leading to limp matzo , so measure carefully and aim for an even smear.
Don't put too much or it will get soggy.: The key sensory cue here is the integrity of the matzo , which should remain crisp and dry around the edges after baking. When the sauce is too heavy, you may notice a soft, pliable texture instead of a pleasant snap, and the flavors can feel muted. To avoid this, trust the measured amount and avoid pooling sauce in the center. A common misstep is assuming more sauce equals more flavor, but with this thin crust, restraint yields a better mouthfeel.
Sprinkle with oregano then top with tomatoes and onions.: As you dust the crushed tomatoes with dried oregano , a warm, herbaceous perfume rises. Layer the paper thin sliced tomato and the delicate slivers of red onion so they overlap but do not form a dense mound, which helps them heat through and release their juices gradually. This balanced layering ensures each bite contains both juicy freshness and an aromatic lift. Avoid piling toppings too thickly, because dense layers take longer to warm and can dampen the crisp base.
Top with 1/4 cup of cheese on each one, olives and bake in the oven until the cheese melts, about 5-6 minutes.: When you scatter the shredded mozzarella , it looks snowy against the reds of the tomatoes, and as it bakes you ll hear a faint sizzle and watch it soften into glossy pools that begin to bubble lightly. The olives will warm and perfume the surface with savory saltiness. Around minute five you ll see the cheese become uniformly molten and slightly stretchy, which signals readiness. If you leave it too long, the cheese may brown and dry, so watch closely during these final minutes. A common error is setting a timer for too long and ending up with overcooked toppings and a chewy base.