German Mohnkuchen (Poppy Seed Cake) with Streusel

German Mohnkuchen is a traditional-style poppy seed cake made with a soft vanilla cake base, a rich poppy seed filling, and a crisp, buttery Streusel topping.

It is especially delicious served with a cup of afternoon coffee and is a wonderful choice for family gatherings, holidays, or a relaxed weekend bake.

Recipe at a Glance

Makes: 10–12 pieces
Prep & baking time: About 1½ hours
Oven temperature: 175°C (350°F)

Ingredients

For the Cake Base

• 200 g all-purpose flour
• 100 g sugar
• 2 eggs
• 100 g softened butter
• 1 teaspoon baking powder
• Vanilla extract
• A pinch of salt

For the Poppy Seed Filling

• 250 g ground poppy seeds
• 500 ml milk
• 100 g sugar
• 1 packet vanilla pudding mix
• 2 tablespoons semolina
• Zest of 1 lemon
• 50 g raisins, optional

For the Streusel

• 100 g all-purpose flour
• 70 g cold butter
• 70 g sugar

How to Make German Mohnkuchen

1. Prepare the Poppy Seed Filling

Pour the milk into a saucepan and add the sugar and vanilla pudding mix. Heat while stirring until the mixture begins to thicken.

Add the ground poppy seeds and semolina. Stir well and continue cooking gently until the mixture becomes thick.

Remove from the heat and stir in the lemon zest. If using raisins, add them at this stage.

Set the filling aside and allow it to cool.

2. Prepare the Cake Base

Preheat your oven to 175°C (350°F).

In a mixing bowl, cream the softened butter and sugar together until smooth. Add the eggs one at a time, mixing well after each addition.

Add the vanilla extract.

In a separate bowl, combine the flour, baking powder, and salt. Gradually add the dry ingredients to the butter mixture and mix until a soft batter forms.

Spread the batter evenly into a prepared baking pan.

3. Add the Poppy Seed Layer

Once the poppy seed mixture has cooled enough to handle, spread it evenly over the cake base.

Try to distribute the filling from edge to edge for an even layer.

4. Make the Streusel

Place the flour and sugar in a bowl.

Add the cold butter cut into small pieces. Rub the ingredients together with your fingertips until coarse, crumbly pieces form.

Avoid working the mixture too much—the cold butter helps create a delicious crumbly topping.

5. Assemble and Bake

Sprinkle the Streusel evenly over the poppy seed filling.

Bake for approximately 45–50 minutes, or until the Streusel topping is golden and crisp and the cake is cooked through.

6. Cool Before Slicing

Remove the cake from the oven and allow it to cool completely in the pan.

For cleaner slices and better-defined layers, refrigerate or rest the cake before cutting.

Helpful Tips

Use Ground Poppy Seeds

For the best texture, use ground poppy seeds. Cooking them with milk helps soften them and allows their nutty flavor to develop.

Keep the Butter Cold for Streusel

Cold butter is important when making Streusel. Work it into the flour and sugar with your fingertips until crumbly rather than forming a smooth dough.

Let the Cake Rest

Mohnkuchen can taste even better after resting. Allowing the cake to sit gives the filling time to settle and makes it easier to slice neatly.

Cool Completely

Don’t rush to cut the cake while it is hot. Cooling completely helps the poppy seed layer hold its shape.

How to Serve Mohnkuchen

German Mohnkuchen is especially enjoyable with afternoon coffee or tea.

Cut it into squares or rectangular slices and serve at room temperature. A light dusting of powdered sugar can also be added before serving if desired.

Frequently Asked Questions

Can I leave out the raisins?

Yes. Raisins are optional and can easily be omitted.

Can I prepare Mohnkuchen a day ahead?

Yes. Preparing the cake ahead can actually make slicing easier because the filling has more time to set.

Why should the poppy seeds be ground?

Ground poppy seeds provide a softer texture and allow their distinctive nutty flavor to blend more easily into the filling.

Why is my Streusel not crumbly?

The butter may have become too warm or the mixture may have been worked too much. Using cold butter and rubbing it briefly into the flour and sugar helps create the classic crumbly texture.

Final Thoughts

German Mohnkuchen combines three delicious layers: a tender vanilla cake base, a rich poppy seed filling, and buttery golden Streusel.

It is a beautiful traditional-style bake for afternoon coffee and a wonderful dessert to share with family and friends. For the best texture, let it cool completely before slicing—and consider making it a day ahead.