Prepare the crust: Preheat your oven to 325°F (160°C). In a medium bowl, combine graham cracker crumbs and sugar. Stir in melted butter until the mixture resembles wet sand.
Press the crust: Press the mixture firmly into the bottom of a greased 9x13-inch baking dish. Bake for 10 minutes or until lightly golden. Remove from the oven and allow to cool while preparing the filling.
Make the cheesecake filling: In a large mixing bowl, beat the softened cream cheese with an electric mixer until smooth and creamy, about 2-3 minutes. Gradually add in the ¾ cup of sugar and continue mixing.
Add eggs and vanilla: Incorporate the eggs one at a time, mixing well after each addition. Add the vanilla extract and mix until well combined.
Mix in sour cream: Fold in the sour cream using a spatula, ensuring no lumps remain. Do not overmix.
Add chocolate chips: Gently fold in the chocolate chips until evenly distributed throughout the batter.
Combine layers: Pour the cheesecake filling over the cooled crust, spreading it evenly.
Bake: Bake at 325°F (160°C) for 25-30 minutes, or until the edges are set and the center is slightly jiggly (it will firm up as it cools).
Cool and chill: Remove from the oven and let it cool at room temperature for an hour. Then, refrigerate for at least 4 hours or overnight for best results.
Slice and serve: Once chilled and firm, cut into bars and serve. Enjoy with a drizzle of chocolate sauce or a sprinkle of extra chocolate chips on top.