I used this cake and caramel recipe to make Cael's 6th birthday cupcakes, but then frosted them with white buttercream instead. To fill with caramel, I just cut a cone out of the top of the cupcake, spooned in about a 2 teaspoons of the caramel, and replace the top of the cupcake.
http://www.marthastewart.com/857647/salted-caramel-six-layer-chocolate-cake
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Unsalted butter, room temperature, for pans
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3 cups all-purpose flour, plus more for pans
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3 cups granulated sugar
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1 1/2 cups unsweetened Dutch-process cocoa powder
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1 tablepoon baking soda
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1 1/2 teaspoons baking powder
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Coarse salt
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4 large eggs
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1 1/2 cups low-fat buttermilk
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1/2 cup plus 2 tablespoons safflower oil
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2 teaspoons pure vanilla extract
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4 cups granulated sugar
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1/4 cup light corn syrup
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2 cups heavy cream
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Coarse salt
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2 sticks cold unsalted butter, cut into tablespoons
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1/4 cup plus 2 tablespoons Dutch-process cocoa powder
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2 sticks unsalted butter, room temperature
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1/2 cup confectioners' sugar
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Coarse salt
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1 pound semisweet chocolate, chopped, melted, and cooled
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Garnish: flaked sea salt, such as Maldon
To make this cake ahead of
time: The caramel can be refrigerated for up to 3 days; bring to room
temperature before using. Cake layers can be refrigerated for up to 3
days (they actually taste better when refrigerated and have a better
texture for stacking). When finished, the frosted cake can be
refrigerated for up to 3 days.
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- Make the caramel: Combine granulated sugar, corn
syrup, and 1/4 cup water in a medium saucepan over high heat. Cook,
without stirring, until mixture is dark amber, about 14 minutes. Remove
from heat, and carefully pour in cream (mixture will spatter); stir
until smooth. Return to heat, and cook until a candy thermometer reaches
238 degrees, about 2 minutes. Pour caramel into a medium bowl, stir in 1
teaspoon coarse salt, and let cool slightly, about 15 minutes. Stir in
butter, 1 tablespoon at a time. Let cool completely.
- Meanwhile,
make the frosting: Whisk together cocoa and 1/4 cup plus 2 tablespoons
warm water in a bowl until cocoa dissolves. Beat butter, confectioners'
sugar, and a generous pinch of coarse salt in a clean bowl with a mixer
on medium speed until pale and fluffy. Gradually beat in melted
chocolate and then cocoa mixture until combined. Let stand for 30
minutes before using.
- Trim
tops of cakes using a serrated knife to create a level surface. Cut each
in half horizontally to form 2 layers. Transfer 1 layer to a serving
platter, and spread 3/4 cup caramel over top. Top with another cake
layer, and repeat with remaining caramel and cake layers, leaving top
uncovered. Refrigerate until set, about 1 hour.
- Frost top and sides of cake in a swirling motion. Sprinkle with sea salt.