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1
Place rack in the center of the oven and prehead to 375.
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2
Line a baking sheet with parchment.
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3
In a medium bowl, stir together both flours, baking powder, and salt.
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4
In a stand mixer (if you have one) fitted with a paddle attachment, beat butter, 4 tablespoons shortening, and brown sugar until light and cream, about 3 minute Add eggs and buttermilk and beat until combined.
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5
In a measuring cup, combine milk, baking soda, and vinegar.
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6
Add this mixture slowly to the batter along with the flour mixture and beat on low speed until completely combined.
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7
Using a spoon or put your batter into a pastry bag fitted with a large round tip or even a ziplock with the tip cut off would work, drop about 1 tablespoon of batter onto your baking sheet, repeat spacing them at least 2 inches apart.
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8
Bake for about 10 min until the cakes begin to brown.
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9
Remove from the oven and let the cakes cool on the sheet for 3-5 min before transferring them to a rack to cool completely.
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10
Make marshmallow cream - In the work bowl of a stand mixer fitter with the paddle beat together marshmallow fluff and shortening, starting on low and increasing to medium speed until the mixture is smooth and fluffy, about 3 minute Reduce mixer speed to low, add confectioner's sugar and vanilla, and beat until incorporated.
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11
Increase mixture speed to medium and beat until fluffy.
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12
Make chocolate ganache - Place your chocolate in a large, heat proof bowl.
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13
Heat the cream in a saucepan over medium heat just until in bubbles.
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14
Pour the heated cream over the chocolate in the bowl and let it sit for about 10 minutes, until the chocolate is melted.
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15
Stir with a whisk until smooth.
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16
Allow the mixture to rest until firm enough to spread, about 2 hours.
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17
Or you can refrigerate it for about 30 min until it is firm enough to spread, shirting every 10 minute.
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18
When cookies are completely cooled and ganache is firmed enough, spread half of cookies with marshmallow cream.
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19
Spread the other half of the cookies with chocolate ganache.
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20
Sandwich together one marshmallow cookie and one chocolate cookie.
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21
Repeat with all cookies.
