2 c. flour, divided
1 1/2 c. light brown sugar, divided
1/2 to 2/3 c. butter
1 c. pecans, broken into lg. pieces
1 c. milk chocolate chips (or I like 1/2 c. milk and 1/2 c. semi- sweet)

Mix flour, 1 cup of the brown sugar, and 1/2 cup butter together with a fork or pastry blender. Press into greased 9 x 12 inch pan. Sprinkle pecans over this mixture. Boil remaining 1/2 cup brown sugar and 2/3 cup butter over medium heat for 1 minute, stirring constantly. Pour over pecans and bake at 350 degrees for 18 to 22 minutes until bubbly and crust is golden. Do not overbake. Sprinkle with chocolate chips and let stand 2 to 3 minutes to melt. Swirl over surface with knife. Cool and cut into squares.