- Preheat oven to 375°F. In a large bowl, combine flours, hazelnut meal, baking soda, and salt. In a small bowl, whisk egg; stir in buttermilk, 3 tablespoon sucanat, lemon zest and vanilla. Add egg mixture to flour mixture and stir until just combined. Stir in raspberries, peaches and 1/4 cup hazelnuts. Prepare topping: In a small bowl, stir together remaining 2 tablespoon hazelnuts and 1 teaspoon sucanat. Line the bottom of a 7x11-inch glass baking dish with parchment paper. Pour batter into pan. Sprinkle topping over batter and lightly press topping down with the back of a spoon. Bake for 28 to 32 minutes, until a toothpick inserted in center comes out clean. Let cool for 5 to 10 minutes. Cut into 8 bars.