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1
Make the cake Preheat the oven to 325.
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2
Liberally grease a large rimmed baking sheet with baking spray.
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3
Line the sheet with parchment paper and liberally grease the paper.
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4
In a large bowl, sift the granulated sugar, flour, cocoa powder, baking soda, baking powder and salt.
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5
In a medium bowl, whisk the eggs with the milk.
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6
In a small saucepan, combine the butter, vanilla and espresso powder with 1/2 cup of water and bring to a simmer, stirring to dissolve the espresso.
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7
Drizzle the hot mixture over the dry ingredients.
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8
Add the egg mixture and whisk until smooth.
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9
Scrape the batter onto the prepared sheet and spread in an even layer.
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10
Bake for about 20 minutes, until set and a cake tester inserted in the center of the cake comes out clean (the cake will look wet).
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11
Transfer the sheet to a rack and let cool.
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12
Meanwhile, make the peanut butter filling In a medium bowl, using a hand mixer, beat the butter with the confectioners sugar at medium speed until light, about 2 minutes.
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13
Beat in the peanut butter and salt, scraping down the side of the bowl as necessary.
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14
Beat in the milk and vanilla.
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15
Line a large baking sheet with parchment paper and generously grease it with baking spray.
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16
Invert the cooled cake onto the prepared sheet.
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17
Peel the parchment paper off the cake; it will be sticky.
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18
Cut the cake in half lengthwise, then crosswise.
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19
Spread the filling all over the cake pieces, leaving a 1/4-inch border all around the sides.
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20
Roll up the cakes lengthwise (the parchment will come off easily) to form 4 logs.
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21
Refrigerate for 1 hour.
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22
Make the ganache In a bowl, combine the chocolate, butter, corn syrup and salt.
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23
In a small saucepan, bring the cream to a simmer.
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24
Pour the hot cream over the chocolate mixture and whisk until smooth.
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25
Let cool.
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26
Line another large baking sheet with parchment paper.
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27
Cut each cake log into 3 equal pieces.
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28
Working with 1 piece at a time and using a fork or skewer, dip the logs into the ganache to coat all over, letting the excess drip off.
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29
Transfer the cakes to the prepared sheet and sprinkle with flaky salt or peanuts.
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30
Freeze until firm, about 1 hour, before serving.