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For the crumb topping:
- 1 cup all-purpose flour
- 1 cup packed light brown sugar
- 1 teaspoon ground cinnamon
- 1/2 teaspoon ground nutmeg
- 1/4 teaspoon fine salt
- 1/2 cup unsalted butter, cold and cut into small cubes
For the cake:
- 2 cups all-purpose flour
- 3 teaspoons baking powder
- 1 teaspoon fine salt
- 1 teaspoon ground cinnamon
- 1/2 ground ground ginger
- 1/4 teaspoon ground nutmeg
- 1/4 teaspoon ground cloves
- 1 1/4 cups pumpkin puree
- 1/2 cup vegetable oil
- 2 cups granulated sugar
- 2 large eggs, room temperature
- 1 teaspoon vanilla extract
- 1 cup buttermilk or milk, room temperature
For the vanilla icing:
- 1 cup powdered sugar
- 2 tablespoons milk
- 1/4 teaspoon vanilla extract
To make the crumb topping:
- Preheat oven to 350°F and spray a 9×9 square or 9×13 rectangle pan with baking spray and set aside.
- In a bowl whisk together flour, light brown sugar, cinnamon, nutmeg, and salt.
- Cut in the small cubes of butter by using a pastry cutter or using your hands, blending the butter into the dry ingredients. Mix until you can form big crumbs, set aside.
To make the cake:
- In one bowl whisk together flour, baking powder, salt, cinnamon, ginger, nutmeg, and cloves, set aside.
- In another bowl whisk pumpkin puree, vegetable oil, and sugar.
- Add in eggs one at a time, whisking well after each addition. Add in vanilla.
- Add in the dry ingredients in 3 additions alternating with buttermilk in 2 additions, beginning and ending with the dry ingredients.
- Pour cake batter into prepared pan and add crumble on top, gently pressing the crumble into the batter.
- Bake for 30 to 35 minutes until a toothpick inserted comes out mostly clean with a few moist, not wet crumbs. (For a 9×13 pan check for doneness at 20 to 25 minutes). Let it cool partially before adding the glaze.
To make the glaze:
- Whisk together powdered sugar, milk, and vanilla until it’s smooth and lump free. Drizzle onto the still warm crumb cake. Slice, serve, and enjoy!