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1
Preparing to bake: Heat the oven to 375 degrees F. Lay down greased parchment paper into two 9-inch cake pans.
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2
Combining the dry ingredients: Whisk together the flour mix, psyllium, baking powder, and salt.
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3
Set aside.
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4
Mixing the wet ingredients: Stir together the milk and vanilla.
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5
Creaming the butter and sugar: Put the butter into the bowl of stand mixer.
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6
Whirl the butter until it has spread out in the bowl.
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Add the sugar.
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Mix the butter and sugar together until the sugar has entirely disappeared into the butter and has come creamy.
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9
Finishing the batter: With the stand mixer running on low, add 1/3 of the dry ingredients.
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10
When there is no flour visible, add 1/2 the milk.
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Repeat, ending with the last of the dry ingredients.
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12
Carefully, scrape the cake batter into a large bowl.
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13
Beating the egg whites: Clean out the bowl of the stand mixer and dry it thoroughly.
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14
Add the egg whites.
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15
Turn on the stand mixer, with the whisk attachment on.
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16
Add the cream of tartar to the egg whites.
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Let the stand mixer run until the egg whites turn white and start to thicken.
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18
Pour in the sugar and continue whisking the egg whites until they have reached soft peaks.
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19
Folding in the egg whites: Pour 1/3 of the egg whites into the cake batter.
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20
Slowly, with sure strokes, use a rubber spatula to fold the egg whites into the cake batter.
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When there is no visible sign of egg whites left, pour another 1/3 of the egg whites.
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Continue doing this until the cake batter is fluffy and increased in volume.
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23
Stir in the last and stop stirring.
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24
Baking the cake: Pour the cake batter equally into the 2 cake pans.
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25
Slide them into the oven and bake until the top of the cakes has a little athletic jiggle, and a toothpick inserted into the middle comes out clean, 30 to 40 minutes.
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26
Allow the cakes to cool in the pan.
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27
Run a butter knife around the edges of the cake pans to loosen the cake.
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28
Carefully, turn the cakes onto cooling racks.