- 1 store-bought or homemade 9-inch pie crust, pre-baked
- 2 to 2.5 lbs ripe tomatoes (a mix of colors if you can get them), sliced ¼-inch thick
- 1 teaspoon kosher salt, for drawing out moisture
- 1 small yellow onion, thinly sliced
- 1 cup shredded sharp cheddar cheese
- 1 cup shredded mozzarella
- ¾ cup mayonnaise
- 2 tablespoons fresh basil, chopped (plus extra for garnish)
- 1 tablespoon fresh chives or green onion, chopped
- ½ teaspoon garlic powder
- Freshly cracked black pepper, to taste