This is a recipe that I have been meaning to get on the site for a while and it’s finally happening! This is far and away the best coffee cake I’ve ever had, and I think that if you try it, you will agree with me. Once again, it comes from cookiesandcups.com who is my go-to for sure fire recipes. I have added some nonfat dry milk powder because I think it gives it that something extra. I also subbed full fat Greek yogurt instead of sour cream because it’s what I had in my fridge. I also left off the glaze because it doesn’t need it in my opinion, but I’ll include it here in case anyone else wants to try it.
Cinnamon Filling
- 3/4 cup light brown sugar
- 3/4 cup all purpose flour
- 2 teaspoons ground cinnamon
Crumb Topping
- 6 tablespoons butter, melted
- 1 cup light brown sugar
- 1 1/2 tablespoons ground cinnamon
- 1 cup all purpose flour
Cake
- 1 cup butter, room temperature
- 1 cup granulated sugar
- 2/3 cup light brown sugar
- 3 eggs
- 1 tablespoon vanilla extract
- 3/4 cup sour cream (or Greek yogurt)
- 1 teaspoon kosher salt
- 3 teaspoons baking powder*
- 2 teaspoons nonfat dry milk powder
- 1 1/4 cup milk
- 3 2/3 cup all purpose flour
Icing
- 1 cup powdered sugar
- 2–3 tablespoons milk
Preheat oven to 350°F. Coat a 9×13 baking dish with nonstick spray. Set aside. In a medium bowl prepare the cinnamon filling by whisking together the brown sugar, flour, and cinnamon until combined. Set aside. To prepare the crumb topping, mix together the melted butter, brown sugar, cinnamon, and flour in a medium bowl until it resembles coarse crumbs. Use your hands to mix to form larger crumb pieces. Set aside. For the cake, mix the butter, granulated sugar, and light brown sugar in the bowl of your stand mixer fitted with the paddle attachment on medium speed for 2 minutes until light and fluffy. Add in the eggs, vanilla, sour cream, salt, baking powder and nonfat dry milk powder and mix for 1 minute until combined and smooth, scraping the sides of the bowl as necessary. Turn the mixer to low and add in the flour and milk in alternating portions, beginning and ending with flour. Mix until just combined and smooth, again, scraping the sides of the bowl as necessary. Spread half of the cake batter into the prepared pan. Sprinkle the cinnamon filling evenly on top of the batter. Carefully spread the remaining cake batter on top of the cinnamon layer. Evenly sprinkle the crumb topping on top. Bake for 40-45 minutes, or until the cake is set and a toothpick inserted in the center comes out clean. Remove cake from oven and place pan on a wire rack to cool completely. If making the icing, whisk together the powdered sugar and milk until smooth and drizzle on top of the cooled cake.
*If you are like me and live at high altitude, reduce the baking powder to 2 1/2 teaspoons and increase the flour by a 1/4 of a cup.