Prepare the Berry Jam:
In a medium saucepan, combine the frozen berries and sugar.
Cook over medium heat, stirring occasionally, until the berries release their juices and the mixture comes to a simmer.
In a small bowl, mix the cornstarch with a few tablespoons of water to create a slurry.
Add the cornstarch slurry to the berry mixture, stirring constantly.
Continue to cook until the jam thickens, then remove from heat and let it cool.
Prepare the Dough:
Preheat your oven to 180°C (350°F).
In a large bowl, beat the eggs with the sugar until well combined.
Add the sour cream and melted butter, mixing until smooth.
In a separate bowl, combine the flour, salt, and baking powder.
Gradually add the dry ingredients to the wet ingredients, mixing until a dough forms.
Assemble the Cake:
Grease a baking dish or line it with parchment paper.
Spread half of the dough evenly in the bottom of the baking dish.
Pour the cooled berry jam over the dough, spreading it out evenly.
Dollop the remaining dough over the top of the jam, spreading it out as much as possible. It’s okay if some jam peeks through.
Bake the Cake:
Bake in the preheated oven for 30-35 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean.
Remove from the oven and let the cake cool in the pan before slicing.
More Information
This berry jam cake is a delightful blend of sweet and tart flavors, with a buttery, tender crumb that pairs perfectly with the rich berry filling. The use of frozen berries makes it convenient and accessible year-round, while the simple ingredients and straightforward process ensure that even novice bakers can achieve delicious results. Serve this cake as a dessert, a snack, or even a special breakfast treat.

Conclusion
Forget about all other cakes with this simple and delicious berry jam cake. Its rich, buttery dough and sweet-tangy berry jam filling make it a standout dessert that’s sure to become a favorite. Try this recipe today and enjoy a slice of pure deliciousness!