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1
Prepare brownie mix according to box instructions, using the two egg-recipe and substituting milk for the water.
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2
Line two 9-inch square baking pans with either parchment paper or wax paper. Spray bottoms with non-stick cooking spray. Pour equal amounts of batter into each pan.
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3
Bake - either in a convection oven at 325 degrees F for 20 minutes, or in a standard oven for about 24-26 minutes. (The convection oven is preferred - it makes a chewier brownie). Bake until a wooden pick inserted in the middle of the brownie comes out clean.
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4
IMPORTANT: Do not overbake!
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5
Allow to cool completely.
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6
Set one brownie pan aside; invert other pan and remove brownie in one piece; return to pan upside down; remove parchment paper.
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7
Brush the brownie evenly with 1/2 of the Kahlua; then top with 1/2 of the mousse, spreading it evenly over the brownie. Spread 1/2 of the whipped cream over the mousse.
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8
Remove second brownie from pan; brush with remaining Kahlua; place it on top of other brownie; spread remaining mousse evenly over the top; spread remaining whipped cream over the mousse.
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9
Sprinkle top evenly with chocolate shavings.
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10
Refrigerate until ready to serve.