Preheat the oven to 350ºF. Spray two 9x5" loaf pans with cooking spray. Line the pans with parchment paper if you want to ensure they come out cleanly. You can also use Baker's Joy pan release.
In a large mixing bowl, combine the cake mix, water, eggs oil, pudding mix and sour cream. Beat until all of the ingredients are well blended into a thick batter. Scrape the sides of the bowl as needed.
Spread half of the batter into the two prepared loaf pans.
In a medium bowl, combine the ingredients for the sugar streusel.
Sprinkle half of the cinnamon and sugar mixture over the batter (keep the other half of the streusel aside for the topping), dividing it between the two pans.
Repeat the layers, adding the remaining bread batter and the remaining cinnamon sugar mixture on top.
Bake for 40-45 minutes. The exact time will depend on the size of your loaf pans. A toothpick inserted into the center of the bread should come out clean.
Allow the bread to cool for at least 20 minutes before you remove it from the pans. Allow the bread to cool on a wire rack.
If you'd like a simple glaze on top, combine 1 cup powdered sugar and a few tablespoons of milk or heavy cream in a small bowl. Whisk until smooth and until it is thin enough to drizzle.
Drizzle the glaze over the bread, slice and serve.
Store in an airtight container at room temperature.
Add a drop or two of green food coloring if you'd like a brighter green color.
Refer to the article above for more tips and tricks.The calories shown are based on the bread being cut into 10 slices each, with 1 serving being 1 slice of bread. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information. The information in the nutrition box are calculated through a program and there is room for error. If you need an accurate count, I recommend running the ingredients through your favorite nutrition calculator.**