Preheat oven to 300°F (150°C).

Line an ungreased cookie sheet with parchment paper or a silicone baking mat.

In a large bowl, cream together the softened butter and brown sugar until light and fluffy.

Gradually add the flour, mixing until a soft dough forms.

Lightly flour your work surface. Roll out the dough to your desired thickness (about ¼ inch is typical).

Cut into shapes using a cookie cutter or slice into squares or rectangles.

Bake for 25 minutes, or until the edges are lightly golden.