Step 1

In a large mixing bowl, mix together the dry ingredients: flour, granulated sugar, brown sugar, baking powder, and baking soda.

Step 2

Add the oil and mix until small lumps begin to form. Add the sour cream, eggs, and vanilla. Mix JUST UNTIL batter forms (do not over mix). The batter will be lumpy, and that's okay.

Step 3

Mix together the 2/3 cup sugar and 1 tbsp cinnamon.

Step 4

Pour and spread 1/3 of the batter into the prepared loaf pan. Sprinkle 1/2 of the cinnamon sugar mixture over top.

Step 5

Pour and spread 1/3 of the batter over the cinnamon sugar layer. Sprinkle the remaining cinnamon sugar over top.

Step 6

Pour and spread the remaining batter over the layer of cinnamon sugar. Set aside to prepare crumble topping.

Step 7

Mix together the flour and sugar in a medium mixing bowl. Cut in the butter until a crumble forms (I like to use my fingers about halfway through the "cutting").

Step 8

Sprinkle the crumble over top of the bread batter.

Step 9

Bake for 60-70 minutes until toothpick inserted comes out clean.

Step 10

Use a fork to whisk together the water and the powdered sugar until thick glaze forms. Drizzle over the freshly baked bread.