Step 1

Preheat the oven to 325 degrees F. Spray three 8-inch cake pans with non-stick spray, add parchment and another coat of spray. Set aside.

Step 2

In a medium size bowl, whisk together the cake flour, baking powder, and salt. Set aside.

Step 3

In the bowl of a stand mixer fitted with the paddle attachment, beat the butter, canola oil, and sugar on high until fluffy and smooth, about 3 to 5 minutes.

Step 4

Add the eggs and egg yolks, one at a time to the bowl and beat on medium until well incorporated. The mixture should look smooth and fluffy. This will take another minute or two. Stir in the extracts.

Step 5

Turn the mixer on low and add 1/3 of the flour mixture to the butter mixture and mix until fully incorporated. Then add half of the sour cream and blend well, followed by another 1/3 of the flour mixture, the second half of the sour cream and lastly, add the remaining flour mixture and mix until incorporated.

Step 6

Evenly distribute the cake batter among the three pans and bake for 25-30 minutes or until a toothpick inserted into the middle of the cakes comes out clean or with just a few crumbs. Make sure not to over bake.

Step 7

Remove cakes from the oven and let cool in pans for 10 minutes before inverting onto cooling racks.

Step 8

Once completely cooled, wrap in plastic wrap and place in the freezer or refrigerator to chill before frosting.

Step 9

In a microwave safe bowl, heat the cream and then pour it over the chocolate to melt. Stir until the mixture is smooth and silky. If needed heat the mixture for another 20 to 30 seconds and stir until the chips are melted. Set aside.

Step 10

In a bowl fitted with a paddle attachment, combine beat the butter on medium-high until light and fluffy.

Step 11

Turn the mixer to medium-low and gradually add the melted chocolate ganache. Stop the mixer and scrape down the sides of the bowl. Beat again for about one minute.

Step 12

With the mixer on low speed, gradually add the powdered sugar, vanilla extract, and salt.

Step 13

Increase the speed to medium-high and beat for another 2-3 minutes, until light and fluffy.

Step 14

Stir by hand to push out air pockets.

Step 15

After leveling each cake layer, place the first cake layer (top side/crumbly side up) on a cake board that has a little frosting on it (which acts like glue to hold the cake in place).

Step 16

Spread about 1 cup of the frosting over the cake layer. Place the second cake layer on top and add another cup of frosting. Make sure to get eye level with the cake to check that your frosting is spread evenly across each cake layer.

Step 17

When you get the final cake layer, place it top side down on the second layer of frosting. Spread a thin coat of frosting around the entire cake to lock in the crumbs. Freeze the cake for 10 minutes to set the crumb coat.

Step 18

Continue to frost and decorate the cake with the remaining frosting.