Step 1

In a large mixing bowl, beat butter with brown sugar until light and fluffy.  You can use an electric mixer to do this or mix by hand with a wooden spoon.

Step 2

Beat in egg and vanilla.

Step 3

In a separate mixing bowl, combine flour, baking powder and salt.

Step 4

Add to butter mixture in two additions and mix just until a soft dough forms.

Step 5

Stir in chocolate chip and toffee bits.

Step 6

Divide dough in thirds.

Step 7

Shape each portion and roll dough by hand into a 7-inch long log and wrap in plastic wrap. The roll will be about 3 inches tall. Place in the refrigerator side by side so the logs do not flatten.

Step 8

Refrigerate for 1 and 1/2 hours.

Step 9

Work with 1 log at a time, leaving the other(s) in the refrigerator.

Step 10

Using a sharp knife, cut into 1/4-inch thick pieces and place on parchment-paper lined baking sheet.

Step 11

Bake one sheet at a time at 375°F for 11-13 minutes.

Step 12

Cool on pan for 5 minutes, then transfer to wire cooling racks.