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To make the cupcakes: Preheat the oven to 375°F, and position a rack in the center of the oven. Line a 12-cup muffin pan with papers and spray the insides, or lightly grease the pan.
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In a medium bowl, beat the butter, vegetable oil, and sugar together until the mixture lightens in color and texture, 60 to 90 seconds.
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Beat in the cake enhancer, salt, baking powder, baking soda, spices, and boiled cider.
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Beat in the eggs one at a time, scraping the bottom and sides of the bowl after each addition.
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Weigh the flour, or measure it by gently spooning it into a measuring cup and sweeping off the excess. Gently mix in the flour, alternating it with the milk.
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Fold in the jammy bits.
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Spoon the batter into the prepared muffin pan — a scone and muffin scoop works well here.
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Bake the cupcakes for 17 to 20 minutes, until they're very light brown and a cake tester inserted into the center of one comes out clean.
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Remove the cupcakes from the oven and after 5 minutes, transfer them to a rack to cool completely.
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To make the frosting: Beat together the butter, meringue powder, salt, and boiled cider until fully combined.
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Gradually add the sugar, beating until the frosting is light and fluffy. Add the milk, if necessary, to make the frosting nicely spreadable.
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Spread or pipe the frosting onto the cooled cupcakes.
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Store unfrosted cupcakes in an airtight container at room temperature for up to 2 days, or in the freezer for up to 1 month. Store frosted cupcakes, covered, in the refrigerator for up to 2 days.