Step 1 Heat the oven to 350 degrees. Set aside an ungreased 8-inch-square pan.
Step 2 Mix together the flour, brown sugar, butter and salt in a mixer or processor until crumbly. Spread the crumbs evenly over the pan. Lay plastic wrap over the top and press them firmly into place. Remove the plastic.
Step 3Bake until lightly browned, about 18 to 20 minutes.