Preheat oven to 325°F (163°C) and grease a springform or 9-inch cake pan.
Make the Crumble: In a bowl, mix coconut flour, brown sugar alternative, cold butter, and spices. Rub together until crumbly. Set aside.
Blend Wet Ingredients: Blend eggs, pumpkin puree, and melted butter until smooth.
Mix Dry Ingredients: In a large bowl, combine coconut flour, brown sugar substitute, cinnamon, nutmeg, ginger, vanilla, and baking powder.
Combine Batter: Mix the wet ingredients into the dry until thick and well combined.
Assemble: Spread the batter into the prepared pan. Top with crumble.
Bake: Bake for 32–35 minutes, until a toothpick inserted comes out clean.
Cool: Let cool 10 minutes in the pan, then transfer to a wire rack.
Make the Drizzle: Beat cream cheese, heavy cream, and powdered sweetener until smooth. Drizzle over cooled cake.
Serve and enjoy with your favorite keto-friendly coffee or tea!