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1
Preheat oven to 350F.
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2
Line two 9-inch square cake pans with 2-inch-high sides with foil, extending foil over sides.
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3
Butter and flour foil.
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4
Using electric mixer, cream butter and both sugars in large bowl until fluffy.
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5
Beat in melted chocolate, cream and vanilla.
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6
Add eggs 1 at a time, beating well after each addition.
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7
Sift flour, cocoa, baking soda and salt into medium bowl.
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8
Stir dry ingredients into batter, which will be very thick.
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9
Divide batter between prepared pans; spread evenly.
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10
Bake until tester inserted into centers comes out clean, about 20 minutes.
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11
Remove from oven.
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12
Sprinkle 1 1/2 cups marshmallows and 1 cup pecans over each cake.
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13
Bake just until marshmallows begin to melt, about 6 minutes.
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14
Transfer to racks.
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15
Cool cakes completely in pans.
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16
Combine sugar and cream in heavy medium saucepan.
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17
Stir over medium heat until sugar dissolves.
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18
Cook without stirring until candy thermometer registers 220F., about 8 minutes.
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19
Remove from heat and whisk in remaining ingredients.
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20
Whisk until all chocolate melts and frosting is smooth.
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21
Refrigerate frosting until spreadable, about 1 hour 15 minutes.
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22
Using foil as aid, lift cakes from pans.
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23
Remove foil.
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24
Place 1 cake layer on plate, marshmallow side up.
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25
Spread 1 1/2 cups frosting over.
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26
Top with second cake layer, marshmallow side up.
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27
Spread remaining frosting in waves on sides (not top) of cake.
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28
(Can be prepared 1 day ahead.
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29
Cover with cake dome and chill.
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30
Bring to room temperature before serving.)