- 1 2/3 cups all-purpose flour
- 1/2 cup brown sugar
- 2 teaspoons baking powder
- 2 teaspoons ground cinnamon
- 1/4 teaspoon ground allspice
- 1/2 cup pumpkin puree
- 1/3 cup whole milk
- 1 egg
- 2 teaspoons vanilla extract
- 3/4 cup brown sugar
- 1/2 cup butter, melted
- 2 teaspoons ground cinnamon
- Preheat oven to 350 degrees F (175 degrees C). Grease a 9-inch square baking dish with butter.
- Combine flour, 1/2 cup brown sugar, baking powder, 2 teaspoons cinnamon, and allspice in a bowl. Beat pumpkin puree, milk, egg, and vanilla extract in another bowl; stir into flour mixture until batter is smooth. Pour batter into prepared baking dish.
- Stir 3/4 cups brown sugar, butter, and 2 teaspoons cinnamon in a small bowl until just combined. Sprinkle over cake batter.
- Bake in preheated oven until a toothpick inserted into the center comes out clean, 20 to 25 minutes.