DOUBLE-LAYER VANILLA-BUTTERMILK CAKE WITH RASPBERRIES AND ORANGE CREAM-CHEESE FROSTING

Steps:

• Bake the Buttermilk Cake:
• Place a rack in middle of oven; preheat to 350°F. Lightly coat cake pans with nonstick spray and line bottoms with parchment paper. Whisk 2 cups flour, 1 tsp. baking powder, 1/2 tsp. baking soda, and 1/4 tsp. salt in a medium bowl; set aside.
• Using an electric mixer on medium-high speed, beat 3/4 cup butter and 1 1/2 cups granulated sugar in a large bowl, scraping down sides of bowl as needed, until light and creamy, about 5 minutes. Add 4 egg yolks in 2 additions, scraping down bowl after each. Beat in 1 tsp. vanilla.
• Reduce mixer speed to low, then add dry ingredients in 2 additions alternately with 1 cup buttermilk in 2 additions, scraping down sides of bowl as needed.
• Using electric mixer on medium speed, beat 4 egg whites in another large bowl until soft peaks form, 2-3 minutes. Slowly add 1/4 cup granulated sugar and continue to beat until stiff, glossy peaks form, about 3 minutes more. Fold half of the egg whites into flour mixture, then gently fold in remaining egg whites.
• Scrape batter into prepared pan; smooth surface. Bake, rotating pan halfway through and covering with foil during the last 15 minutes of baking, until golden brown, firm to the touch, and a tester inserted into the center comes out clean, 45-50 minutes. Transfer pan to a wire rack and let cake cool.
• Repeat steps with second prepared pan and remaining cake ingredients to bake the second layer.
• Make the Vanilla Syrup:
• Combine granulated sugar and 1/4 cup water in a medium saucepan. Scrape in vanilla seeds, add pod, and stir to combine. Bring to a boil, cover, and steep at least 15 minutes. Set aside to cool. Discard pod before using.
• Make the Orange Cream-Cheese Frosting:
• Using electric mixer on medium-high speed, beat cream cheese and butter in a large bowl until smooth, about 1 minute. Beat in orange zest, orange juice, and vanilla. Reduce mixer speed to medium and beat in powdered sugar, scraping down bowl as needed, until light and fluffy, 2-3 minutes.
• Assemble the cake:
• Spread 1 Tbsp. frosting in the center of a platter. Place 1 cake layer, top side down, in the center. Using a pastry brush, brush 3 Tbsp. vanilla syrup over top of cake. Using an offset spatula, spread 1 cup frosting evenly over top. Arrange 6 oz. raspberries in a ring around perimeter of cake, pressing to adhere. Fill interior of ring with 6 oz. raspberries. Spread 1 cup frosting over raspberries inside of ring (do not frost raspberries at the perimeter).
• Carefully place second cake layer, top side down, on frosted raspberries, gently pressing down to secure. Brush 3 Tbsp. syrup over top of cake with pastry brush. Spread 2 1/2 cups frosting evenly over top and sides, carefully covering raspberries. Chill at least 30 minutes to let frosting set.
• Remove cake from refrigerator. Frost top and sides, swirling decoratively, making sure to cover bottom of platter; reserve remaining frosting for another use. Chill at least 30 minutes or up to overnight to let frosting set. Before serving, top cake with remaining 3 oz. raspberries and edible flowers, if using.
• Do Ahead
• Cake can be made 3 days ahead; wrap tightly in plastic and chill, or freeze up to 2 weeks. Syrup can be made 5 days ahead; store in an airtight container and chill. Frosting can be made 3 days ahead; cover with plastic wrap, pressing directly on surface, and chill. Bring to room temperature before using.