Pineapple Pie

I found this recipe in an old cookbook with no cover. Mrs. Sam Evanoff, International Falls, Minn. Ingredients- 1/4 cup butter (soft), 1 cup powdered sugar, 1 1/2 cups drained crushed pineapple, 2 egge seperated, 1 unbaked 9-inch pie shell. Instructiona- Cream butter and sugar, add egg yolks and stir until light. Add pineapple. Beat egg whites medium stiff. Combine with creamed mixture. Pour into unbaked shell and top with lattice strips. Bake 375 degrees until crust is brown and filling set, about 30 minutes.