Preheat the oven to 400ºF. Grease an 8×8" cake pan.: The kitchen will begin to smell faintly of warm metal as the oven climbs to 400ºF , and preheating ensures the batter springs to life once it goes in. A properly preheated oven produces even rise and a golden crust, which you will notice in color and a slight firming at the edges. Greasing the 8 inch Square Cake Pan prevents sticking and helps you remove clean squares. Common mistakes include not fully preheating, which can cause a dense center, or over-greasing, which can fry the edges instead of allowing a proper crust to form.
In a medium bowl, whisk together eggs, pumpkin puree, oil, and molasses. Stir in remaining ingredients just until combined.: As you whisk these wet ingredients, you should see a uniformly smooth, glossy batter forming, with the molasses adding a deeper amber hue. The mixture should smell faintly of cooked pumpkin and the sweet backing of molasses. This step develops emulsification, so the oil disperses evenly to keep pockets of fat from forming in the batter, which would cause uneven texture. Avoid leaving visible streaks of oil or lumps; that indicates insufficient mixing and can result in inconsistent crumb.
Pour batter into prepared pan.: When you fold in the all purpose flour , cornmeal , baking powder , kosher salt , and pumpkin spice seasoning , the batter will thicken and take on a slightly grainy texture from the cornmeal . You will notice the aroma of warm spices rising. The reason to stop at just combined is to avoid overworking the gluten in the flour, which can make the cornbread tough. One common pitfall is vigorous stirring that creates a gluey texture, so use a folding motion and pause when you see no dry streaks.
Bake for 25 to 30 minutes or until a toothpick inserted in the center comes out clean.: As you transfer the batter, it should flow smoothly but hold some body, not be overly runny. Tap the pan gently on the counter to settle the batter and release any large air pockets, which will help it bake evenly. You will see the surface level out and small bubbles may rise and pop on top. If the batter looks unusually thin or watery, double check ingredient measurements; too much liquid will yield a soggy center.
Bake for 25 to 30 minutes or until a toothpick inserted in the center comes out clean.: During baking the kitchen will fill with the scent of pumpkin and spice, and the top will turn a warm golden brown. Check for doneness by inserting a toothpick into the center; if it comes out clean or with a few moist crumbs, you are done. The edges should pull slightly away from the pan . A common error is removing it too soon, which leaves a gummy interior, so if in doubt give it a few extra minutes and watch the color for guidance.