1. Preheat oven to 350 degrees. In a medium saucepan, heat pumpkin puree, cinnamon, and pumpkin spice over medium heat. Stir often for about 5-7 minutes. 

2. Remove from heat and stir in sugar, brown sugar, oil, and cream cheese. Whisk for several minutes until all of the cream cheese is mixed in. Let sit for 5 minutes to cool before adding the eggs. 

3. Whisk in eggs and buttermilk until fully mixed together. After it is completely smooth, fold in flour, baking powder, baking soda, and salt. Mix just until combined. 

4. Grease two 8 1/2 inch x 4 1/2 inch loaf pans with non-stick cooking spray or butter. Pour batter into pans. 

To make streusel topping:

1. In a small bowl, add brown sugar, softened butter, and flour. Using a fork, press together until combined. 

2. Sprinkle topping evenly over pumpkin bread batter. Bake for 44-48 minutes or until the center is cooked through. Check by placing a toothpick in the center to make sure it comes out clean. 

3. Let pumpkin loaves cool for 20 minutes and then turn out onto a wire rack. Let cool. 

4. Serve with butter.