Step 1Heat the oven to 350 degrees. Set aside an ungreased 8-inch-square pan.
Step 2Mix 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.
Step 1While the base is baking, combine the sugar, maple syrup, eggs, flour, butter, salt, Bourbon and vanilla in the same (unwashed) mixer or processor until just mixed together. Stir in the pecans.
Step 2When the base is baked, remove it from the oven and evenly spoon the topping over the hot base.
Step 3Bake until the surface is set and lightly browned, about 30 minutes. Cool completely on a rack, then refrigerate it in order to cut into neat squares.