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Export 15 ingredients for grocery delivery
Step 1
Preheat the oven to 350°F. Spray a 9x13 baking dish with baking spray, set aside.
Step 2
Place the chocolate chips in a medium-sized bowl. Warm the milk in the microwave until it reaches 180-190°F, watch it carefully. Pour hot milk over the chocolate chips and let it sit for 5 minutes.
Step 3
Whisk until combined.
Step 4
Add the sour cream and whisk until smooth, set aside.
Step 5
In a medium-sized bowl, stir together the flour, cocoa powder, baking soda, and salt.
Step 6
In a large bowl with an electric hand mixer, mix the brown sugar with the oil until combined.
Step 7
Add the vanilla and eggs one at a time until incorporated.
Step 8
Add half of the dry mixture, mix to combine.
Step 9
Add half of the chocolate/sour cream mixture, mix to combine. Repeat with the remaining dry and wet ingredients.
Step 10
Pour cake batter into the prepared baking dish. Bake for 30-35 minutes until a toothpick inserted into the center comes out clean. Let cool completely.
Step 11
While the cake is cooling, make the filling.
Step 12
Add the milk and flour to a small saucepan, whisk to combine. Place over medium heat and cook, stirring constantly until thickened to a paste. Let this mixture cool to room temperature.
Step 13
Add the butter and shortening to a large bowl, whip with an electric hand mixer until combined.
Step 14
Add the powdered sugar a little at a time until fully mixed in, the mixture will be thick.
Step 15
Add the cooled milk/flour paste and vanilla to the bowl. Stir it in until incorporated and then whip it for 3 minutes on medium-high speed until it resembles a whipped cream-like consistency.
Step 16
Smooth this over the cooled cake. Place the cake into the fridge while you assemble the ganache topping.
Step 17
Place the chocolate chips into a medium-sized bowl. Warm the heavy cream in the microwave until it reaches 180-190°F, watch it carefully. Pour the hot cream over the chocolate chips. Wait 5 minutes and whisk until smooth. Let this mixture stand for 10 minutes to cool slightly.
Step 18
Pour the ganache over the top of the cake, there may be a little bit leftover depending on how deep your pan is.
Step 19
Place the cake back into the fridge, uncovered, for 45 minutes to set. Slice and serve.