Preheat & Prep: Preheat oven to 350°F (175°C). Line a 9×13 pan with parchment paper because future-you will appreciate easy cleanup.
Make the Crust: Mix graham cracker crumbs, melted butter, and sugar until it looks like wet sand. Press firmly into the bottom of the pan. Bake for 8–10 minutes, then let it cool slightly.
Mix the Filling: In a large bowl, whisk pumpkin purée, brown sugar, eggs, vanilla, spices, and salt until smooth. Stir in evaporated milk last.
Assemble: Pour the pumpkin filling over the warm crust and smooth the top. Try not to lick the spoon. (Or do. I won’t tell.)
Bake: Bake for 40–45 minutes, until the center is set but still slightly jiggly. That jiggle means creamy, not underbaked.
Cool & Chill: Let bars cool at room temp, then refrigerate for at least 1 hour before slicing. This step matters if you want clean, Instagram-worthy bars.