How to Make the Crust

1. Preheat oven to 350°F. Line a 9×13 baking dish with tin foil.
2. In a large bowl, combine the flour, cocoa powder, and powdered sugar. Add the butter and cut it in using a pastry blender or your hands. Work the butter in until the mix has the consistency of sand. Be patient, it will take at least five minutes or so.
3. Pour the crust mix into the baking pan and press it to make an even layer in the bottom of the pan. Bake the crust for 18-20 minutes.

How to Make the Filling

1. While the crust is baking, prepare the filling. First, place the chocolate in a bowl. Place the bowl in the microwave and melt the chocolate in 30-second increments stopping to stir until the chocolate is melted.
2. In a large bowl, combine the corn syrup, brown sugar, flour, and eggs, and then stir in the melted chocolate. Add the pecans and stir until just combined. Pour the filling over the top of the hot crust. Bake at 350 degrees for 30-40 minutes until the middle is set and a toothpick comes out clean.
3. Cool the bars in the pan and then cover them with plastic wrap overnight. Slice into bars the next day.