Preheat the oven to 350˚F.
Generously butter or grease a 9x5x3 loaf pan.
Mix together the dry ingredients and one cup of flour in a bowl.
Add the butter, pumpkin, milk, and eggs.
Using a hand mixer on low-speed mix until combined, then beat on high-speed for two minutes.
Add the remaining flour and stir on low-speed, to combine, then beat for on high for 30 seconds.
Pour the batter into the prepared pan.
Crumble the streusel over the top of the batter making sure to evenly distribute it. If you put it all in the middle it will sink down, and make a delicious streusel stuffed loaf which is just as good!
Bake on 350˚ for 60-65 minutes or until a toothpick inserted comes out clean.
Cool on a baking rack for ten minutes then gently remove it from the pan.
Cool completely on the baking rack.