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1
Preheat oven to 350F (180C).
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2
Grease and flour 3 8-inch round cake pans.
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3
In a large bowl, measure first 9 ingredients.
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4
With mixer at low speed, beat ingredients until just mixed, scraping bowl constantly with spatula.
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5
Dissolve 2 teaspoons instant coffee into 1 cup boiling water; add to ingredients in bowl.
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6
Increase mixer speed to medium; beat 2 minutes, scraping sides of bowl occasionally.
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7
Pour batter into pans.
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8
Bake 25 to 30 minutes.
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9
Cool cake in pans on racks for 10 minutes.
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10
Remove from pans and cool completely.
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11
While cake is cooling, finely chop Heath Bars.
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12
In a cup dissolve 1/2 teaspoon instant coffee in 1 teaspoon hot water; cool.
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13
With serrated knife, cut each cake layer in half to make 6 thin layers in total.
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14
In a large bowl, beat whipping cream, brown sugar and coffee until stiff peaks form.
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15
To assemble cake, place 1 layer on cake plate; spread with about 1/2 cup of the whipped cream mixture.
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16
Reserve about 23 of the chopped Heath Bars; sprinkle layer with about 1/5 of the remaining 13 Heath Bars.
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17
Repeat layering 4 more times.
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18
Top with remaining cake layer.
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19
Thinly spread remaining whipped cream mixture over side and top of cake.
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20
Gently press reserved chopped Heath Bars onto top and sides.
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21
Refrigerate cake until ready to serve.