Preheat your oven to 350°F (175°C). Grease and flour an 8x8-inch pan. Or line it with parchment paper if you’re in a no-scrub mood.
In a big bowl, whisk together the flour, sugars, baking soda, baking powder, salt, and all those warm cozy spices.
Add the oil, pumpkin purée, eggs, milk, and vanilla. Stir just until everything’s combined. Don’t overmix—it’s cake, not cement.
Pour the batter into the pan. Give it a little wiggle to level things out.
Bake for 30–35 minutes. A toothpick in the center should come out clean (unless you stabbed a melted chocolate chip, in which case… lucky you).
Let it cool before slicing—unless you enjoy mouth burns in the name of impatience.