Using a large bowl whisk sour cream, baking soda and 2 eggs.
Next pour in melted butter and give it a good whisk. After add sugar and vanilla extract, whisk until everything is combined.
Now, add 1 cup of flour at a time to the batter and whisk until combined, add another cup of flour - whisk (when it gets harder to whisk, use spatula, then hands). Repeat until all flour is used. The dough should be super soft to touch and not sticky when touching with dry finger. Cover and let rest for 30 minutes in room temperature.
Preheat the oven to 400F (I HAVE AN OVEN WITH THE FAN) and get 8 parchment paper rectangles ready with a round dinner plate and butter knife (that's for cutting out circle layers from the dough). Next, place dough onto floured table and divide it into 8 equal pieces. Using hands roll each piece into a ball and place them back into the bowl, cover.
Onto a clean table add one parchment rectangle sheet, sprinkle flour over the top, add one of the dough balls and place it in the middle of the parchment paper, sprinkle a little flour and roll it into a circle (the size of a round dinner plate).
Place the plate over rolled out dough and using a dull side of the butter knife cut the dough into a perfect circle (be careful not to cut the parchment paper), don't remove the dough edges we will use them to decorate the cake. Remove the plate, place cake layer with cut out edges onto a baking sheet and BAKE FOR ABOUT 3-4 MINUTES, or until slightly golden color on top. Cool on a flat surface. Repeat with the rest of the dough.
How to Make Custard Filling for Cake
To make custard filling for cake, in a mixing bowl whisk together sugar and flour. Then beat in eggs, set aside.
Using a sauce pan pour in milk, and bring it to a gentle boil over medium/low heat, whisking continuously. Once the milk starts bubbling, slowly pour in egg mixture while whisking continuously. Once it starts gently boiling, simmer on low heat until the custard filling thickens about 2-3 minutes, whisking continuously.
Remove from the heat and pour in vanilla extract and add butter cubes. Stir until butter melts.
Assembling Custard Cake
Place 1st layer on a cake plate or stand. Add warm/hot vanilla custard filling over the layer and evenly spread it with a spoon, place another layer over the top and repeat with the rest of the custard filling and cake layers.
Using a rolling pin collect all fo the baked edges and roll them until crumbly texture. Sprinkle the cake with these crumbles (the side of the cake too). Cover with plastic wrap and let the cake rest for at least 2 hours in the fridge, best over night. Cut a slice and enjoy!
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Notes
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