Southern Tomato Slab Pie

3 cups finely crushed buttery cracker crumbs (such as Ritz)
1 cup grated Parmesan cheese
1/2 cup butter, melted
3 pounds tomatoes, sliced into 1/4-inch thick rounds
1/2 teaspoon salt
1 cup mayonnaise
3/4 cup chopped scallions
1/2 teaspoon pepper
1 cup shredded cheddar cheese
1 cup shredded mozzarella cheese

1. Preheat the oven to 350 degrees.

2. Combine the cracker crumbs, Parmesan cheese and melted butter in a bowl.

3. Press the crust mixture into the bottom of a rectangular baking pan, pressing it up the sides a bit.

4. Place in the oven for 10 minutes or until crisp. Set aside to cool.

5. Lay out the tomato slices on a dish towel and season with salt.

6. Combine the mayonnaise, scallions, pepper and half of each of the cheeses in a bowl. Spread the mixture over the cooled crust.