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A slice of condensed milk layer cake served on a plate, showing the chocolate and vanilla layers with cream.

No-Fail Condensed Milk Layer Cake with Cocoa and Sour Cream Cream

This soft, nostalgic cake is made with sweetened condensed milk, cocoa, and a light sour cream filling. No mixer, no fuss — just tender sponge layers and a creamy, balanced flavor. A perfect make-ahead dessert for celebrations or cozy weekends.
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Prep Time 25 minutes
Cook Time 30 minutes
Cooling and assemble time 15 minutes
Total Time 1 hour 10 minutes
Course Dessert
Cuisine American, European, International

Ingredients
  

For the Cake Layers:

  • 200 g plain flour
  • 175 g unsalted butter melted
  • 550 g sweetened condensed milk
  • 4 small eggs
  • 1 tsp baking powder + lemon juice to activate
  • 1 tbsp cocoa powder for half the batter

For the Cream:

  • 400 g sour cream 20% fat
  • 2 tbsp powdered sugar vanilla if available
  • 50 g sweetened condensed milk adjust to taste
  • 25 g unsalted butter softened
  • 1 –2 tsp lemon juice to taste

For Decoration:

  • Fresh blueberries and blackberries
  • Fresh mint
  • Crumbs from cake trimmings

Instructions
 

  • Preheat the oven to 180°C (350°F) and line a baking tray (35×25 cm) with parchment paper.
  • In a bowl, combine melted butter and sweetened condensed milk.
  • Add the eggs and stir until smooth.
  • Add the flour gradually and mix until combined.
  • Mix baking powder with lemon juice, then stir into the batter.
  • Pour half of the batter onto the prepared tray, spread evenly, and bake for 15 minutes until golden.
  • Let cool and cut into circles or rectangles. Save trimmings.
  • Add cocoa powder to the remaining batter, mix well, and bake the second layer the same way.
  • Crumble the leftover trimmings into a bowl to make fine crumbs.

Make the Cream:

  • In a mixing bowl, combine sour cream, powdered sugar, condensed milk, butter, and lemon juice.
  • Stir or beat briefly until smooth. Adjust sweetness to taste. Chill while layers cool.

Assemble the Cake:

  • Alternate white and cocoa sponge layers, spreading cream between each one.
  • Coat the top and sides with the remaining cream.
  • Sprinkle with cake crumbs and decorate with berries and mint.
  • Refrigerate for 4–5 hours or overnight to allow the flavors to meld.

Notes

Chill the cake overnight for the best flavor and texture.
Don’t skip activating the baking powder with lemon — it creates a soft, airy sponge.
You can bake both layers at once if you have two trays.
This cake keeps well in the fridge for up to 3 days.
Keyword cocoa sponge cake, condensed milk layer cake, easy celebration cake, homemade layer cake, no-fail cake recipe, sour cream cake, summer berry cake