Preheat the oven to 350°F and evenly grease a 9X13 baking dish.
In a large mixing bowl, combine the pumpkin crunch cake ingredients: flour, sugar, baking powder, baking soda and salt. Whisk the mixture until combined.
2 cups all-purpose flour, 1 ½ cup granulated sugar, 3 teaspoons baking powder, 1 teaspoon baking soda, ½ teaspoon salt
Measure out 1½ cup out of the cake mix from the bowl and set it aside for the topping.
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Pour melted butter and egg into the bowl of cake mix and stir. Press the mixture into the bottom of a baking dish in an even layer.
1 egg, 8 tablespoons butter
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Use the same mixing bowl to combine the canned pumpkin, eggs, pumpkin pie spice, milk and sugar. Whisk it well, then pour the pumpkin mixture over the bottom layer.
1 15 ounce canned pumpkin puree, 1 cup milk, 3 eggs, 1 cup sugar, 2 teaspoons pumpkin pie spice
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Take the reserved dry crunch cake mixture and coat the top of the cake with it. Sprinkle with pecans.
½ cup pecans, 1 ½ cups reserved crunch cake mix
Pour the remaining melted butter over the top of the cake, trying to coat as much of the topping as possible with a thin drizzle of butter. It will not cover it entirely, and this is totally fine! Do not mix it in.
4 tablespoons butter
Bake the pumpkin dump cake for one hour on the bottom oven rack.
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Let cool for at least thirty minutes to serve warm or chill for three hours before serving. Store Old-Fashioned Pumpkin Crunch Cake in the refrigerator for up to five days.