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1
For the cake: Preheat the oven to 350 degrees F. Coat a 9-by-13-inch rectangular baking pan with nonstick cooking spray.
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2
Line the bottom of the pan with parchment paper and coat again with nonstick cooking spray.
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3
Combine the flour, cornmeal, baking powder, baking soda and salt in a small bowl.
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4
Whisk together and set aside.
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5
Beat the butter with the granulated sugar on medium-high speed with an electric mixer until smooth and fluffy, 3 minutes.
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6
Beat in the eggs, one at a time, until combined, and then beat in the vanilla.
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7
Reduce the speed to low and beat in one-third of the flour mixture until just combined.
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8
Beat in half the buttermilk and then repeat, adding the flour in two more increments and alternating with the second half of the buttermilk.
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9
Stir in the sprinkles.
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10
Transfer to the prepared pan and spread the batter evenly.
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11
Bake until golden brown and the top springs back to a light touch, 30 to 35 minutes.
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12
Cool 15 minutes in the pan.
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13
Run a small knife around the edges of the cake to release the sides and turn the cake out onto a baking sheet.
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14
Remove the parchment paper and then flip again onto a serving platter or cutting board so the top of the cake is back on top.
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15
Cool completely before frosting.
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16
For the frosting: Place the butter and salt in a large bowl.
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17
Beat with an electric mixer on medium speed until fluffy.
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18
Add the white chocolate and beat until fluffy.
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19
Gradually beat in the confectioners' sugar and the vanilla.
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20
Increase the speed to medium-high and beat until very smooth and fluffy.
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21
Transfer 1/2 cup of the frosting to a pastry bag fitted with a small rosette tip.
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22
Frost the top and sides of the cake with the remaining frosting.
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23
For the garnish: Place the blueberries in six rows of 6 berries each in the top left hand corner of the cake.
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24
Trim and halve the strawberries lengthwise and make four rows of strawberries across the cake.
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25
Pipe 13 stars between the blueberries and use the remaining frosting to pipe a border around the bottom of the cake.
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26
Brush the berries with the melted jelly.
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27
Cut and serve.