Preheat oven to 325°F. Spray a metal 13x9-inch baking pan with nonstick cooking spray. Line the bottom with two pieces of parchment paper. One lengthwise and one side to side leaving a 2 inch overhang. Spray the parchment paper with cooking spray. Set aside.
Melt butter in a saucepan over medium-high heat. When the butter begins to boil, remove the saucepan from the heat and add chocolate chips, stirring once to coat. Allow to sit for 5 minutes before whisking together until fully combined.
Meanwhile, in a small bowl use a whisk to sift together the flour, cocoa powder, espresso and salt.
In a large mixing bowl whisk together brown sugar, granulated sugar, eggs and vanilla. Add melted chocolate mixture whisking to combine.
To the wet ingredients add the sifted dry ingredients and gently stir until fully incorporated.
Pour the batter evenly into the prepared pan and bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.
Pecan Pie Topping: While brownies bake in a medium heavy bottomed saucepan melt together brown sugar, butter, corn syrup, heavy cream and salt. Cook over medium high heat until it comes to a gentle boil then lower the heat to medium and cook for 2 minutes stirring constantly. Remove from the heat adding pecans and vanilla. Mix well. Set aside.
Combine: Once the brownies are baked through increase the oven temperature to 350°F. Spread the pecan pie mixture over the brownies from end to end.
Return to the oven and bake for an additional 25-30 minutes until golden and set.
Allow southern pecan pie brownies to cool completely in the pan on a cooling rack.
Use the parchment paper as "handles" to remove the brownies from the pan. Cut into squares and enjoy.