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1
Heat oven to 350 degrees (175 C.).
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2
Line cookie sheets with parchment paper.
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3
Sift together flour, baking powder, and baking soda in a medium bowl and set aside.
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4
Put sugar, margarine, cocoa, and salt in bowl of standing mixer and beat on medium speed until fluffy.
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5
Add eggs and vanilla and continue to beat.
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6
Add half the milk, then half the flour mixture, beating after each addition until smooth; repeat with remaining milk and flour mixture.
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7
Spoon or pipe batter onto parchment-lined baking sheets, making 3-inch rounds 2-inches apart.
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8
Bake until cookies are set, about 12 minutes (or more).
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9
Allow to cool, then remove from parchment.
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10
Melt bittersweet and semisweet chocolates and butter in the top of a double boiler over simmering water over medium heat.
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11
Add confectioners sugar, corn syrup, vanilla, salt, and 6 tbsp (90 ml).
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12
boiling water and mix to a smooth, stiff paste with a rubber spatula.
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13
Thin icing with up to 8 tbsp (125 ml).
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14
more boiling water.
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15
Icing should fall from a spoon in thick ribbons.
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16
Keep icing warm in a double boiler over low heat.
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17
Put sugar, butter, shortening, milk, vanilla, and salt in mixing bowl.
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18
Beat on low speed to mix, then increase to medium and beat until light and fluffy.
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19
Using a metal spatula, spread about 1 tbsp (15 ml).
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20
of warm fudge icing on half of the flat side of each cookie.
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21
Spread the other half of each cookie with heaping 1 tbsp (15 ml).
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22
buttercream icing.