Coffee Cake with Crumble Topping and Brown Sugar Glaze
Ingredients
For the Crumb Topping:
1cupbrown sugar, packed
1/2cupgranulated sugar
1/2teaspoonsalt
2teaspoonscinnamon
1cup2 sticks unsalted butter, melted
2 1/2cupsall-purpose flour
For the Cake:
1 1/2cupscake flour
1/2cupall-purpose flour
1teaspoonbaking soda
1teaspooncinnamon
1/2teaspoonsalt
1/2cup1 stick unsalted butter, at room temperature
1 1/4cupslight brown sugar, packed
2large eggs, room temperature
1teaspoonvanilla extract
1cupGreek yogurt, room temperature
For the Brown Sugar Glaze:
1/2cuplight brown sugar, packed
1/2teaspoonvanilla extract
2tablespoonswater
Instructions
To make the topping: In a medium bowl, mix the brown sugar, granulated sugar, salt, cinnamon, and melted butter together. Mix in flour until absorbed. Spread out on a rimmed baking sheet;set aside.
Preheat the oven to 350°. Grease a 9x13 inch square baking pan and set aside.
To make the coffee cake: In a medium bowl, whisk together the flours, baking soda, cinnamon, and salt; set aside.
In stand mixer fitted with paddle attachment, beat butter and brown sugar at medium speed until light and fluffy, about 3 minutes, scraping down sides and bottom of bowl with rubber spatula. Add eggs 1 at a time, beating well after each addition, about 20 seconds, and scraping down beater and sides of bowl as necessary. Add vanilla and mix to combine. Reduce speed to low and add one-third flour mixture, followed by half of greek yogurt, mixing until incorporated after each addition, 5 to 10 seconds. Repeat, using half of remaining flour mixture and all of remaining greek yogurt. Scrape bowl and add remaining flour mixture; mix at low speed until batter is combined, about 10 seconds. Remove bowl from mixer and fold batter once or twice with rubber spatula to incorporate any remaining flour.
Pour mixture into prepared pan, spread into corners, and level surface with rubber spatula. Sprinkle the crumb topping evenly over the batter. Bake until the top is golden and a toothpick inserted into the center comes out with just a few crumbs attached, 30 to 35 minutes. Let the cake cool on a wire rack while you prepare the brown sugar glaze.
To make the glaze: In a small bowl, combine brown sugar, vanilla and 2 tablespoons water. Whisk until smooth. Drizzle the glaze evenly over the top of the cake.