Magic Pumpkin Pie

1 (9-inch) unbaked pie shell
1 (16 ounce) can pumpkin
1 (15 ounce) can sweetened condensed milk
1 egg
1/2 teaspoon salt
1/2 teaspoon nutmeg
1/2 teaspoon ginger
3/4 teaspoon cinnamon

In large bowl, blend all ingredients except pie shell. Turn mixture into pie shell. Bake at 375 degrees F for 50 to 55 minutes, or until knife inserted comes out clean; cool.