This is the “Golden Trio” of Central European baking: the tartness of plums, the earthy richness of poppy seeds, and the buttery crunch of streusel (crumbs).
To keep this “easy,” we’ll use a simple stir-together base that acts as a cushion for the fruit and poppy seeds. No rolling pin required!
💜 Easy Plum, Poppy & Streusel Sheet Cake
1. The Quick “Stir-In” Base
- 2 cups (250g) All-purpose flour
- ¾ cup (150g) Sugar
- ¾ cup (180ml) Buttermilk (or yogurt) — this makes it extra soft!
- 2 Eggs
- ½ cup (100ml) Oil
- 2 tsp Baking powder
Instructions: Simply whisk the eggs, sugar, oil, and buttermilk in a bowl. Fold in the flour and baking powder. Spread this batter onto a small parchment-lined baking sheet or a 9×13 inch pan.
2. The Poppy & Plum Layer
- 1 cup Poppy seed filling (use the “Mohn-Back” canned style or the soaked version from our earlier recipe)
- 1 lb (500g) Fresh plums, pitted and quartered
Instructions: 1. Dollop the poppy seed filling over the raw batter and use a knife to swirl it in slightly. 2. Arrange the plum quarters on top, skin-side down, pressing them slightly into the “clouds” of batter.
3. The “Cinnamon Crunch” Streusel
- 1 cup (125g) Flour
- ½ cup (100g) Cold butter, cubed
- ½ cup (80g) Sugar
- 1 tsp Cinnamon
Instructions: Rub the ingredients between your fingers until you have chunky crumbs. Scatter them generously over the plums.
Bake: 180°C (350°F) for 35–40 minutes until the plums have bubbled and the crumbs are golden.
💡 Why This Combination is “Addictive”
- The Juice: As the plums bake, their juice seeps into the poppy seeds, creating a “jammy” layer between the fluffy cake and the crunchy top.
- The Contrast: You get the soft cake, the “pop” of the seeds, the silken fruit, and the biscuit-like crunch of the streusel in every single bite.
👵 Grandma’s “Speedy” Gourmet Tip
- The “Marzipan” Trick: If you have any marzipan in the cupboard, grate it into the streusel mix. It goes incredibly well with plums and poppy seeds.
- The Glaze: While the cake is still piping hot, brush the exposed plums with a little plum jam to make them shine like jewels.
🥧 Pro Tip for Plums
If your plums are very ripe and juicy, toss them in a tablespoon of cornstarch before putting them on the cake. This prevents the juice from making the cake base “soggy” and turns it into a thick sauce instead.