Preheat the oven to 350ºF (or 325ºF if you are using a convection oven).
Combine the dry ingredients all-purpose flour, cocoa powder, baking soda, and salt.
Cream the butter and brown sugar in a stand mixer or with a hand mixer.
Add the egg and mix until emulsified; scrape the bowl.
Add about half of the dry ingredients and begin to stir together slowly.
Gradually pour in the buttermilk and vanilla and then add the remaining dry ingredients.
Mix to form a smooth batter adding a little more buttermilk, if needed.
Scoop the batter onto sheet pans lined with parchment paper – an ice cream scoop is ideal for this – tap the pans against the counter lightly to spread out the batter, divide into 16 portions.
Bake for 10-15 minutes until the cakes spring bake to the touch.
Remove from oven and let cool.
FOR THE FILLING
Put the Pixies in the refrigerator for about 45 minutes so that they are firm and easy to chop up.
Combine the heavy cream, powdered sugar, and vanilla extract in a mixing bowl or a stand mixer and whip until the cream is light and fluffy, and holds its own shape.
Cut the Pixies into small pieces, add to the whipped cream, and fold in the Fannie May Pixies bits.
Divide the cream into 8 portions and scoop out onto 8 of the 16 cakes.
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