Preheat oven to 350 degrees Fahrenheit. Beat butter, sugar, brown sugar, vanilla, and salt in the large bowl of a mixer until blended. Add eggs. Beat well. Stir together flour, baking soda, baking powder, and gradually add to creamed mixture just until blended. Stir in toffee bits and chocolate chips. Dough will be slightly sticky, but form into balls as best as you can, or drop by heaping tablespoons and onto a greased cookie sheet