Ingredients
- 1 unbaked pastry shell (9 inches)
- 3/4 cup chopped onion
- 1 tablespoon butter
- 2 tablespoons all-purpose flour
- 2 cans (14-1/2 ounces each) diced tomatoes, drained
- 1 tablespoon Italian seasoning
- 1 teaspoon salt
- 1 cup mayonnaise
- 3/4 cup shredded part-skim mozzarella cheese
- 3/4 cup shredded Parmesan cheese
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