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1
Preheat the oven to 350F.
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2
Grease two 8-inch round cake pans, line with cutout parchment paper, grease again, and dust with a little cocoa powder.
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3
In the bowl of a stand mixer fitted with the paddle attachment, whisk together the flour mix, cocoa powder, xanthan gum, sugar, baking soda, baking powder, and salt.
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4
Add the egg replacer, rice milk, canola oil, vanilla, and warm water and beat on medium-low speed until smooth, about 3 minutes, scraping down the sides of the bowl as necessary.
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5
Divide the batter evenly between the two pans.
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6
Bake in the center of the oven for about 45 minutes, rotating the pans halfway through.
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7
Bake until the cake is pulling away slightly from the sides of the pans and a skewer inserted into the center of the cake comes out clean.
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8
Let cool in the pans on a cooling rack for 30 minutes.
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9
Cover the cake pan with a large plate, flip, peel off the parchment paper, and flip the cake back onto the rack, right side up, to cool completely.
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10
Repeat with the other cake.
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11
Once the cakes have cooled completely, you may use a serrated knife to trim the tops to make them level.
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12
Frost with Dark Chocolate Frosting (or Vanilla Frosting, page 93, or Chocolate Buttercream Frosting, page 91).
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13
Once the frosting sets, store covered.
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14
Place the chocolate chips in a microwave-safe bowl.
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15
Melt in the microwave, stopping to stir every 30 seconds.
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16
It will take about 2 minutes to melt them.
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Stir until smooth, about 1 minute.
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18
Let cool to room temperature.
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19
Combine the cocoa powder and boiling water in a small bowl, stirring until smooth and the cocoa has dissolved completely.
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20
In the bowl of a stand mixer fitted with the paddle attachment, combine the shortening, confectioners sugar, salt, and rice milk, beating on medium speed for about 3 minutes, or until light and fluffy.
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21
Add the melted chocolate and beat on low speed for 2 minutes, scraping down the sides of the bowl as necessary.
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22
Add the cocoa mixture, and beat for about 1 more minute, or until combined.