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For the cupcakes: Preheat the convection oven to 325 degrees F or a standard oven to 350 degrees F.
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In large mixer bowl, cream together the granulated sugar, butter and peanut butter until light and fluffy with heavy duty mixer.
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Add the eggs, one at a time, and mix thoroughly after each addition.
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Add the vanilla and mix well.
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Combine the flour, baking soda and salt.
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Add half of the flour to the mixer bowl along with 1/2 cup of the half-and-half.
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Mix until the flour is mixed in, scraping the sides of the bowl with a rubber spatula.
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Add the rest of the flour and the other 1/2 cup half-and-half.
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Mix until the batter is smooth and all of the flour lumps are gone.
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Fill 24 cupcake liners half full and bake for 20 minutes in the convection oven or 28 minutes in the standard oven.
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The tops of the cupcakes should be lightly browned.
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Check the cupcakes to make sure no batter sticks to a wooden toothpick when inserted into the cupcake.
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Cool the cupcakes completely.
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For the salted caramel filling: In heavy medium saucepan, cook the granulated sugar by itself over medium-high heat.
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As the sugar starts to melt, stir continuously until all the sugar is melted and is a dark amber color.
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Remove from the heat.
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Stir in the butter until it is completely melted; the mixture will bubble up.
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Then add the cream and stir until smooth.
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Sprinkle in the sea salt and stir slightly.
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Cool to room temperature.
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Refrigerate until ready to use.
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For the peanut butter buttercream: In large mixer bowl, beat together the butter, peanut butter and half of the powdered sugar using heavy duty mixer.
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Add the half-and-half and the rest of the powdered sugar, along with the vanilla, and mix well.
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If the frosting is thicker than you would like, add 1 teaspoon of additional half-and-half at a time, mixing well after each addition until the frosting reaches the correct consistency.
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The thickness may depend on the humidity levels in your region.
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To assemble: When cupcakes are cooled to room temperature, make a 3/4-inch hole in the middle of each cupcake using a sharp knife.
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Leave a small amount of cake in the bottom of each cupcake so that your filling doesn't fall out the bottom of the cupcake.
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Using a small zipper bag, fill each cupcake to the top with salted caramel filling.
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Then frost with peanut butter buttercream.
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You may top cupcakes with chopped peanuts and a salted caramel drizzle as desired.