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For the cake:
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1. Preheat oven to 325u00b0F. Grease two 8-inch cake pans with nonstick cooking spray.
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2. In a large bowl, sift together both flours, baking soda, baking powder and salt. Set aside.
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3. In the bowl of an electric mixer, fitted with the whisk attachment, beat together the sugar, canola oil, butter, vanilla and lemon extract. Beat well at high speed until light and fluffy, about 6-8 minutes.
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4. Beat the eggs in one at a time. After adding all eggs beat on medium speed for 3-4 minutes.
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5. Slowly add in the dry ingredients alternately with the buttermilk (add dry ingredients in 4 divisions and liquid ingredients in 3 divisions). It is very important to begin and end the additions with the dry ingredients. Do not over mix the batter. As soon as it has no lumps in the batter, remove from mixer and use spatula to fold until all flour is incorporated.
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6. Spread batter evenly in each pan. Place in oven and bake for 27-35 minutes (turn pans half way through) or until a wooden toothpick inserted in the center comes out clean. Let cool completely before filling and frosting.
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For the frosting:
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In the bowl of a stand mixer, fitted with the whisk attachment, mix together the powdered sugar, lemon zest and butter on low speed until it becomes sort of crumbly. Add the lemon extract and a little of the milk. Add the cream cheese in chunks. Beat until smooth and fluffy, adding only enough milk to bring the frosting to a creamy spreadable consistency.
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To assemble:
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Fill and frost the cake the cooled cake layers. Slice and serve.
