2/3cupbrown sugar – for this version I swapped this for 2/3 cup brown sugar blend with a sugar subtitute. You can find these blends in the baking aisle.
Heating oven to 350. Grease 9×13 baking dish with non-stick cooking spray.
Make crumble by adding all of the dry ingredients (flour, brown sugar blend, sugar, salt, and cinnamon) to a medium bowl. Whisk together until well mixed.
Add in butter cubes and cut in using two knives. You can also use your hands to get the butter mixed in. Mix until it starts to clump. This will be a drier looking cinnamon crumble topping.
Set aside the topping and prepare the coffee cake.
In a large bowl, combine all of the cake ingredients (yellow cake mix, egg, greek yogurt, Mazola Corn Oil, and vanilla). Mix until combined. The batter will be thick and may have some lumps.
Spray a spatula with cooking spray and spread the batter in the bottom of your baking dish.
Sprinkle the crumb topping over the cake. Cover all of the cake batter, including the edges.
Bake for 35-40 minutes or until a toothpick comes out clean.
Notes
You can also use melted butter or margarine and just stir it in until the mixture gets crumbly. This will give you a finer texture to your topping.