Grease the bottom and sides of a 9x13 inch cake pan with non-stick cooking spray.
In a large bowl combine the pumpkin, evaporated milk, brown sugar, eggs and pumpkin pie spice.
15 oz canned pumpkin puree, 12 oz evaporated milk, 1 cup (213g) packed brown sugar, 3 large eggs, 2 tsp pumpkin pie spice
Whisk until combined. Pour this mixture into the greased pan.
Sprinkle the cake mix powder on top of the batter as evenly as possible.
15.25 oz yellow cake mix
Sprinkle the pecans evenly over the batter.
1 cup (114g) chopped pecans
Pour the melted butter evenly over the top of the cake.
1 cup (226g) unsalted butter
Bake for 45 to 50 minutes, until the edges are browned and the top is golden.
Video
Notes
Here’s a quick homemade mix for 2 teaspoons of pumpkin pie spice:
1 teaspoon ground cinnamon
½ teaspoon ground ginger
¼ teaspoon ground nutmeg
¼ teaspoon ground allspice (or cloves, if you prefer stronger spice)
Gluten Free: Use a gluten free yellow cake mix in place of the regular mix. I tested it with a 15 oz box and it works.To Store: Cover and refrigerate for up to 4 days. Warm slices before serving if you like it cozy.To Make Ahead: Bake the day before and refrigerate once cooled. The flavors deepen overnight.To Freeze: Bake in an aluminum foil pan for easy freezing. Cool completely, then wrap the whole pan in plastic wrap and foil. Thaw in the fridge overnight.