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CAKE:
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Preheat oven to 350u00b0F. Spray two 9-inch-diameter cake pans with 2-inch-high sides with nonstick spray. Line pan bottoms with parchment paper. Sift flour, sugar, cocoa, baking soda, and salt into large bowl. Whisk 2 cups water, oil, vinegar, and vanilla in medium bowl to blend. Gradually add water mixture to dry ingredients, whisking until batter is smooth. Divide batter between prepared pans (scant 3 cups each).
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Bake cakes until tester inserted into center comes out with a few crumbs still attached, about 28 minutes. Cool cakes in pans 15 minutes. Cut around cakes and turn out onto racks. Peel off parchment and cool.
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FILLING:
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Heat the cream until it just begins to boil. Pour it over the chocolate in a medium bowl. Whisk until the chocolate melts, then whisk in the peanut butter until it's all incorporated and smooth. Set aside 1/4 of the filling for the first layer of frosting. Cool the other 3/4 completely, then gently stir in the peanut butter cups.
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FROSTING:
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Cream together the butter and peanut butter. Add the vanilla, then the sugar. I beat mine until it was pretty fluffy.
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ASSEMBLY:
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Place one 9-inch round on a cake stand or plate. Cover the top in the peanut butter fudge filling. Place the second 9-inch round on top. Using the reserved filling, spread a thin layer on the outside of the cake. Refrigerate until the fudge is set and firm to the touch.
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Slather the whole thing in the peanut butter frosting. Decorate with peanut butter cups.
