Preheat your oven to 375°F, and line a loaf pan with parchment paper.
In a large bowl, combine all of your dry ingredients for the cake.
Create a well in the middle of the bowl, and add in your wet ingredients.
Mix only until all of the ingredients are combined. Pour the mixture in to your loaf pan.
In a smaller bowl, combine all of the ingredients for the streusel topping. Sprinkle over the cake ingredients in the loaf pan.
Bake for 55-60 minutes, until a tester comes out clean. Let the cake sit in the pan on a wire rack for ten minutes.
Gently pull the cake up and out of the pan using the parchment paper, and allow it to cool on the wire rack. The cake will keep for a few days on the counter if it's covered tightly.