Preheat your oven to 350°F (175°C). Grease and flour a 9x13 inch baking pan.
In a medium bowl, combine graham cracker crumbs and 0.5 cup sugar. Stir in melted butter until well combined. Press mixture evenly into the bottom of the prepared pan.
In a large bowl, beat cream cheese until smooth. Gradually beat in 1 cup sugar until combined. Beat in eggs one at a time, then stir in vanilla extract.
Pour cheesecake mixture over the crust. Bake for 20 minutes.
While the cheesecake is baking, prepare the pecan pie topping. In a separate bowl, combine chopped pecans, brown sugar, corn syrup, melted butter, and vanilla extract. Mix well.
Carefully spread the pecan pie topping evenly over the partially baked cheesecake. Return the pan to the oven and bake for another 25-30 minutes, or until the edges are set and the center is just slightly jiggly.
Let the bars cool completely in the pan on a wire rack. Chill in the refrigerator for at least 2 hours before cutting into bars.
Notes
For best results, ensure cream cheese is at room temperature before mixing.