Follow these simple steps to create your Pecan Pie Brownies:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish.
2. Melt Butter: In a medium saucepan, melt 1 cup of unsalted butter over low heat.
3. Mix Brownie Ingredients: Remove from heat and stir in 2 cups of granulated sugar. Allow to cool slightly.
4. Add Eggs and Vanilla: Add 4 large eggs one at a time, mixing well after each. Stir in 1 teaspoon of vanilla extract.
5. Combine Dry Ingredients: In a separate bowl, whisk together 1 cup of all-purpose flour, 1 cup of unsweetened cocoa powder, 1/2 teaspoon salt, and 1/2 teaspoon baking powder.
6. Combine Mixtures: Gradually stir the dry mixture into the wet mixture until combined.
7. Spread Brownie Batter: Pour the brownie batter into the prepared baking dish, spreading it evenly.
8. Prepare Pecan Pie Topping: In a mixing bowl, combine 1 cup of light corn syrup, 3/4 cup of packed brown sugar, 1/4 cup of melted unsalted butter, 3 large eggs, and 1 teaspoon of vanilla extract. Whisk until smooth.
9. Add Pecans: Fold in 2 cups of chopped pecans into the topping mixture.
10. Pour Topping: Carefully pour the pecan topping over the brownie layer.
11. Bake: Bake in the preheated oven for 30-35 minutes, or until the topping is set and slightly golden.
12. Cool: Remove from the oven and allow to cool for 15-20 minutes before slicing.
13. Serve: Cut into squares and enjoy!

These steps will guide you in creating Pecan Pie Brownies that are sure to impress anyone fortunate enough to enjoy them.