1-First, preheat your oven to 350°F and line a 9×13 inch pan with foil, giving it a light grease for easy removal later. This simple prep keeps things from sticking and makes cleanup a breeze. Once that’s done, you’re ready to build that crunchy base.

2-Combine the graham cracker crumbs, ¼ cup granulated sugar, and melted butter until it looks like wet sand, then press it evenly into the pan. Bake for 10-15 minutes until it’s golden and smells amazing, then let it cool a bit on a wire rack. For the filling, whisk together the pumpkin puree, pumpkin pie spice, ground cinnamon, and flour in a bowl and set it aside.

3-Beat the cream cheese and 1 ⅔ cups granulated sugar until smooth, then mix in the vanilla extract, sour cream, and salt. Add the eggs one at a time, beating just until combined to keep the texture creamy.

4-Next, stir 1 ½ cups of that cream cheese mixture into the pumpkin blend. Spoon alternating dollops of the plain and pumpkin mixtures over the cooled crust, then swirl gently with a knife for that pretty marbled look. Bake for 35-45 minutes until the edges set and the center jiggles a little.

5-Let the bars cool fully on a wire rack, then chill in the fridge for at least 8 hours. The total time, including prep, baking, and chilling, is about 9 hours and 15 minutes, yielding around 18 bars.