In order for baked goods with berry filling to turn out decent, you need to achieve its uniform and sufficiently thick consistency.
The jam often turns out too runny for this task.
In such cases, experienced housewives usually use regular starch. The additional ingredient has a sufficient effect on the berries, making them thicker. However, many note that such baked goods acquire a characteristic flavor.
In addition, it is extremely difficult to make the filling homogeneous due to the lumps.
The best way to cope with this task is with croutons, which we are used to using for breading. They go extremely well with jam, making it moderately thick and appetizing.
The beauty of croutons is that no one will taste them.
It is recommended to first add 1-2 spoons of the additional component and evaluate the result. After that, the amount of breadcrumbs can be increased as desired.