Parmesan Tomato Pie

Ingredients (10)

• + 1 recipe pastry for a 9-inch single pie crust add to pantry
• ✓ ½ cup grated Parmesan cheese
• + 2 large tomatoes, seeded and sliced add to pantry
• + 3 tablespoons all-purpose flour add to pantry
• + 1 sweet onion (such as Vidalia®), minced add to pantry
• + ½ cup chopped fresh basil add to pantry
• + ½ teaspoon salt add to pantry
• ✓ ½ teaspoon ground black pepper
• + ½ cup Dijon mustard add to pantry
• ✓ ¼ cup mayonnaise