In a large mixing bowl, cream butter and sugars until light and fluffy.
Add eggs, one at a time. Beat in vanilla.
Add flour & baking powder and mix.
Stir in zucchini and butterscotch chips.
Spread into a greased 15 in. x 10 in. x 1 in. baking pan. It will seem like it won't fit, but it will.
Bake at 350 degrees F for 25-30 minutes until lightly browned.
Cool on a wire rack.