Preheat oven to 350 degrees. Grease loaf pan.
In a mixing bowl, beat butter, adding sugar gradually until light and fluffy. Add eggs; beat until fluffy.
Stir in Bisquick, salt, pineapple and walnuts. Mix well. Pour into prepared pan.
Bake for 45 minutes or until toothpick is dry and clean and top is golden brown. Cool for 10 minutes and remove from pan and let cool completely on wire rack. Makes 1 loaf. Enjoy!