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Preheat the oven to 350°
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Adding 1 extra egg per package, prepare the brownie mix as directed.
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Line two square baking dishes with foil (leaving 2 inches over the edge on two sides) and thinly coat with cooking spray.
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Put half of the batter in each baking dish.
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Bake for 30-40 minutes, until a toothpick comes out clean.
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Let cool for at least 30 minutes.
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Using the foil 'handles' pull the cake out of the dish.
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Remove from foil and place in freezer. (I wrapped mine in saran wrap before putting them in the freezer, but I don't know how necessary that is.)
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Trim the edges so you have clean squares (make sure they are the same size!).
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Putting a thick layer of frosting between the two brownie squares, stack them together.
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Coat the bottom 2/3 of the cake with the chocolate frosting (dirt).
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Mix the green gel coloring into the vanilla frosting.
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Coat the top 1/3 of the cake with the green frosting (grass).
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Serve and enjoy!