Additions to the Batter Base after removing one cup for the topping:
1 cup buttermilk (or 1 cup milk plus 1 Tbsp. white vinegar)
1 egg
1 tsp. baking soda
1 tsp cinnamon
1 tsp nutmeg
Additions to the topping:
1 tsp. cinnamon
2 Tbsp. Flour
2 Tbsp. Sugar
Glaze:
½ cup powdered sugar
1 Tbsp. milk
Instructions
Preheat oven to 350. Spray a 9 x 13 inch pan with PAM baking spray. In a large bowl, combine oil, brown sugar, sugar, flour, and salt. Mix well. Remove one cup of mixture into another smaller bowl before adding buttermilk, egg, baking soda, cinnamon, and nutmeg. Pour this mixture into the prepared pan.
Add cinnamon, flour, and sugar to the remaining mixture and combine until crumbly. If necessary, add more flour and sugar until it reaches the desired consistency. Sprinkle the crumbs on top of the batter.
Bake for 25-30 minutes.
While baking, combine powdered sugar and milk. Drizzle with glaze after the cake is removed from the oven.
Recipe by Five Wooden Spoons at https://www.fivewoodenspoons.com/2013/09/13/cinnamon-crumb-cake/