Oh So Good Coffee Cake

Recipe for Coffee Cake: 

• -  2 cups cake flour
• -  1 1/2 cups granulated sugar
• -  1 1/2 teaspoons baking powder
• -  3/4 teaspoon baking soda
• -  1/2 cup butter at room temp
• -  1 cup buttermilk
• -  2 large eggs
• -  1 teaspoon vanilla extract
• -  1/2 cup light brown sugar

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1. Preheat oven to 350 degrees F.  Grease a 9x13-inch baking dish, if not per-stick.
2. Combine cake flour, granulated sugar, baking powder, and baking soda in a large bowl. Cut butter into flour mixture until mixture resembles coarse crumbs. Reserve about 1/2 cup butter crumbs.
3. Stir buttermilk, eggs, and vanilla extract into remaining crumbs until batter is just combined; pour batter into prepared baking dish. Sprinkle reserved butter crumbs (1/2 cup) and 1/2 cup light brown sugar over batter.
4. Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 35 minutes.     (* allrecipes.com referenced for this recipe, but modifications were made).