Let’s start by learning how to make a delicious crumb topping, often known as a streusel topping. This topping adds a crunchy texture to your cake, and the best part is that it’s quite simple to prepare.

Firstly, gather your ingredients - flour, brown sugar, cinnamon, and pumpkin pie spice. Start by combining these ingredients in a large bowl. Next, add in the butter. Using a fork, mix everything together until you achieve a crumb-like texture. Once your streusel topping is ready, set it aside for later use.

Next, let’s make the pumpkin coffee cake batter. Begin by sifting your all-purpose and almond flour into a medium-sized bowl.

To this, add the rest of your dry ingredients - a blend of cinnamon, pumpkin pie spice, baking powder, baking soda, and a dash of sea salt. Use a whisk to stir all these ingredients together until they are well combined. Once mixed, set this bowl aside as well.

After these wet ingredients are well combined, remove the bowl from the mixer stand. Gradually add your previously prepared dry ingredients to this wet mixture in three separate additions. Using a rubber spatula, gently fold in the dry ingredients, taking care not to deflate too many air pockets in the batter. This helps to maintain the fluffy texture of your cake.

Finally, remove the cake from the baking dish and transfer it onto a wire rack to cool down further. If you wish, you can dust it with some confectioners’ sugar before serving to add an extra touch of sweetness.