Preheat the oven to 350
Grease a 9" square pan and line with parchment or foil, leaving enough to overhang on two sides to make removing the cake easy.
Grease the foil/parchment
In a medium bowl whisk together the flour, baking soda, salt, and spices
In a large bowl whisk together the eggs, sugar butter and pumpkin.
Pour the wet ingredients into the dry and fold just until combined.
Add the batter to the prepared pan and smooth with a spatula
Top with the crumb topping being sure to break up any overly large pieces.
Bake in the preheated oven for 45 to 50 minutes until a tester comes out clean.
Cool on a wire rack for about 10 minutes then remove from the pan to cool completely
Dust with powdered sugar before serving