Total preparation time 40–45 minutes (10–15 minutes prep + 30 minutes baking)
Number of servings 16–20 squares (tray approx. 25 × 40 cm)
Note 1 cup = 400 ml
Tips for guaranteed results
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Place the jam in small dollops evenly over the surface so the cake doesn’t become heavy and rises nicely
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For a fresh note, add a teaspoon of finely grated lemon zest to the batter
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The cake is great simply dusted with powdered sugar or served with yogurt
Conclusion
Grandma’s poppy-seed cake is exactly that simple “one-cup” recipe worth keeping on hand. Minimal ingredients, quick preparation, and a reliably moist result. In its basic version it tastes great; with a bit of jam or peanut butter it gains a lovely flavor accent. An ideal dessert for everyday or for Sunday coffee.

