• Preheat oven to 350F. Grease a 9x13-inch baking dish. Sit aside.

Brownie Layer

• In a large, microwave-safe bowl, heat the butter and chocolate together in the microwave for 30 seconds. 
  ½ cup butter, 4 ounces unsweetened chocolate
• Stir, and continue heating and stirring in 15 second intervals until chocolate has melted.
• Add sugar, vanilla, and salt. Stir to combine.
  1 tablespoon vanilla extract, ¼ teaspoon salt, 1 cup granulated sugar
• Stir in eggs until combined.
  2 large eggs
• Mix in the flour until batter is smooth and glossy. 
  ½ cup all-purpose flour
• Pour batter into prepared pan. Set aside.

Pecan Praline Layer

• In a large saucepan, melt butter.
  ½ cup butter
• Remove from heat, and stir in brown sugar until combined.
  ¾ cup brown sugar,
• Stir in egg yolks and vanilla until combined.
  2 egg yolks, 1 teaspoon vanilla extract
• Add flour, baking soda, and salt. Stir until just combined.
  ½ cup all-purpose flour, ½ teaspoon baking soda, ½ teaspoon salt
• Stir in chopped pecans. 
  2 ½ cups coarsely chopped pecans
• Drop spoonfuls of the pecan praline layer over the brownie layer. The pecan praline layer will spread during baking to cover brownie layer.
• Bake for 20-25 minutes, or until edges are browned.
• Let cool completely before cutting.