Steps:
- CRUMB TOPPING: Whisk flour, sugar, and salt in a medium bowl. Stir in nuts. Add butter; using your fingertips, work butter into dry ingredients until large, moist crumbs begin to form. Set topping aside. DO AHEAD: Can be made 5 days ahead. Cover and chill. CAKE: Preheat oven to 350°. Coat pan with nonstick spray. Line bottom with parchment paper; set aside. Whisk flour, cornmeal, baking powder, baking soda, and salt in a medium bowl; set aside. Using an electric mixer on medium speed, beat ¾ cup sugar and butter in a medium bowl until light and fluffy, 3-4 minutes. Beat in vanilla. Add eggs one at a time, beating to blend between additions and occasionally scraping down sides of bowl, until mixture is pale and fluffy, 3-4 minutes longer. With mixer on low speed, add dry ingredients to bowl in 3 additions, alternating with buttermilk in 2 additions, beginning and ending with dry ingredients. Pour half of batter into prepared pan and smooth top. Whisk remaining 3 Tbsp. sugar and cinnamon in a small bowl; sprinkle evenly over batter in pan. Spoon remaining batter over; smooth top. Toss blueberries with panko in a small bowl; scatter evenly over batter. Sprinkle crumb topping over blueberries. Bake cake until top is golden brown and a tester inserted into the center comes out clean, 55-65 minutes. Let cool completely in pan. DO AHEAD: Can be made 1 day ahead. Store airtight at room temperature.
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