To prepare the salsa, combine the first 7 ingredients in a medium bowl.
To prepare the pie, combine crackers, cheese, butter, and 1 egg white in a medium bowl. Toss with a fork until moist; reserve 2 tablespoons. Press the remaining cracker mixture into bottom and up the sides of a 9-inch pie plate coated with cooking spray. Bake at 400° for 5 minutes; cool on a wire rack.
Combine 1 cup milk, corn, sugar, and onion salt in a medium saucepan. Bring to a boil over medium heat; reduce heat, and simmer 3 minutes. Combine 1/4 cup milk and flour in a small bowl; gradually add to corn mixture. Cook until thick (about 1 minute); remove from heat. Stir in 1/2 cup onions and olives. Combine 2 egg whites and the egg in a small bowl; gradually add to corn mixture. Pour into prepared crust, and sprinkle with 2 tablespoons cracker mixture and paprika.
Bake at 400° for 20 minutes or until the center is set.