• Preheat the oven to 325F (170C). Line an 8x8 inch pan with parchment paper or aluminum foil so that there's an overhang around the edges.

Graham Crust

• Stir together the melted butter and graham crumbs.
• Press the mixture into the bottom of the lined pan, creating an even layer.
• Bake in the middle of the preheated oven for 8 minutes. Remove from the oven and leave the oven turned on.

Cheesecake Layer

• In a medium bowl, beat the cream cheese and sugar until smooth and creamy. This will take about 2-4 minutes until smooth.
• Add in the egg, sour cream and vanilla extract. Beat until smooth.
• Pour the batter into the prepared pan and smooth the top.

Chocolate Chip Cookie Dough

• In a medium bowl, beat the butter and sugars until creamed.
• Mix in the egg and vanilla extract.
• Add in the flour, baking soda and salt. Beat together, starting on a low speed.
• Stir in the chocolate chips.
• Using lightly greased hands, pinch of sections of cookie dough, flatten slightly and place on top of the cheesecake layer. Repeat the process until the cheesecake layer is covered. If you have some gaps, that's OK. Your hands will get sticky.
• Bake in the middle of the preheated oven for about 35-40 minutes. When finished, the top should look set and golden brown.
• Remove from the oven. Let the bars cool fully (in the pan). Then cover the pan and place in the fridge to chill for at least 2 hours or overnight. When ready to slice, lift the bars out of the pan using the overhang. Place on a cutting board and slice with a sharp knife.