Pinto Bean Pie

1/2 cup sugar
1 cup brown sugar
1/2 cup butter
2 eggs, beaten
1 heaping cup mashed beans (1-1/2 cups cooked beans=about 1 cup mashed)
1 9-inch unbaked pie shell

Mix sugars, butter and eggs until creamy. Add mashed beans and blend thoroughly. Pour into pie shell. Bake at 375 for 20 min. Reduce to 350 degrees and bake for an additional 25 minutes or until a knife inserted into the pie comes out clean.