Amish Blueberry Kuchen With Vanilla Custard and Buttery Streusel

Imperial October 25, 2026October 25, 2026

Quick Recipe Version (TL;DR)

Amish Blueberry Kuchen with Buttery Streusel is a rustic, Pennsylvania Dutch-inspired coffee cake with a tender cake-style base, juicy blueberries, creamy vanilla custard, and a golden cinnamon crumble. This version uses baking powder rather than yeast, so there is no rising time.

Yield: 9 generous squares
Prep Time: 25 minutes
Cook Time: 1 hour, including a 12-minute base prebake
Cooling Time: 1 hour
Total Time: 2 hours 25 minutes, including cooling
Oven Temperature: 350°F (175°C), conventional oven
Pan: 9-inch square metal baking pan, at least 2 inches deep

Quick Ingredients

For the pan: 1 teaspoon unsalted butter.
Cake base: 1 1/4 cups all-purpose flour, 1 teaspoon baking powder, 1/4 teaspoon fine salt, 6 tablespoons softened unsalted butter, 1/3 cup granulated sugar, 1 large egg, 1 teaspoon vanilla extract, and 1/3 cup whole milk.
Blueberries: 2 cups fresh blueberries and 1 teaspoon cornstarch.
Vanilla custard: 2 large eggs, 1/4 cup granulated sugar, 1 tablespoon cornstarch, 1/2 cup full-fat sour cream, 1/2 cup whole milk, and 1 teaspoon vanilla extract.
Streusel: 3/4 cup all-purpose flour, 1/3 cup packed light brown sugar, 1/2 teaspoon ground cinnamon, 1/8 teaspoon fine salt, and 4 tablespoons cold unsalted butter, cubed.

Do This

1. Heat the oven to 350°F (175°C). Butter and parchment-line a 9-inch square metal pan.
2. Make the streusel by rubbing its dry ingredients with the cold butter until crumbly. Refrigerate.
3. Whisk together the custard ingredients. Separately, toss the blueberries with 1 teaspoon cornstarch.
4. Make the cake batter, spread it in the pan, and prebake for 12 minutes to lightly set the surface.
5. Scatter the berries over the base, slowly pour on the custard, and sprinkle evenly with streusel.
6. Bake for about 48 minutes more, until golden and the custard is set with a slight central wobble. Cool in the pan for 1 hour before cutting.

Why You’ll Love This Recipe

Four lovely textures: Soft cake, juicy berries, silky custard, and crisp, buttery crumbs make every bite interesting.
Sweet without being overly rich: The lightly sweetened base lets the blueberries and vanilla shine.
No yeast or rising time: This approachable cake-style kuchen comes together with familiar baking ingredients.
Perfect for sharing: Serve it at brunch, alongside afternoon coffee, or as a simple summer dessert.

Grocery List

Produce: 2 cups fresh blueberries, about 300 g.
Dairy: Unsalted butter, whole milk, and full-fat sour cream; also pick up 3 large eggs from the refrigerated egg case.
Pantry: All-purpose flour, granulated sugar, light brown sugar, baking powder, cornstarch, vanilla extract, ground cinnamon, and fine salt.

Full Ingredients

For the Pan

1 teaspoon unsalted butter, softened

For the Tender Cake Base

1 1/4 cups (156 g) all-purpose flour, spooned into the cup and leveled
1 teaspoon baking powder
1/4 teaspoon fine salt
6 tablespoons (85 g) unsalted butter, softened but not melted
1/3 cup (67 g) granulated sugar
1 large egg, at room temperature
1 teaspoon vanilla extract
1/3 cup (80 ml) whole milk, at room temperature

For the Blueberry Layer

2 cups (300 g) fresh blueberries, rinsed, picked over, and thoroughly dried
1 teaspoon (3 g) cornstarch

For the Vanilla Custard

2 large eggs, at room temperature
1/4 cup (50 g) granulated sugar
1 tablespoon (8 g) cornstarch
1/2 cup (120 g) full-fat sour cream, at room temperature
1/2 cup (120 ml) whole milk, at room temperature
1 teaspoon vanilla extract

For the Buttery Cinnamon Streusel

3/4 cup (94 g) all-purpose flour, spooned into the cup and leveled
1/3 cup (67 g) packed light brown sugar
1/2 teaspoon ground cinnamon
1/8 teaspoon fine salt
4 tablespoons (57 g) cold unsalted butter, cut into 1/2-inch cubes

Amish Blueberry Kuchen With Vanilla Custard and Buttery Streusel – Closeup

Step-by-Step Instructions

Step 1: Prepare the oven and pan

Set a rack in the center of the oven and preheat to 350°F (175°C). Grease a 9-inch square metal baking pan, at least 2 inches deep, with 1 teaspoon softened butter. Line the bottom and two opposite sides with a strip of parchment paper, leaving a 2-inch overhang to help lift out the cooled cake.

Use a solid-bottomed pan rather than a springform pan, since the custard is quite fluid before baking.

Step 2: Mix the cinnamon streusel

In a medium bowl, stir together 3/4 cup flour, the brown sugar, cinnamon, and 1/8 teaspoon salt. Add the cold butter cubes. Rub the butter into the dry ingredients with your fingertips, or use a pastry blender, until the mixture forms uneven crumbs ranging from coarse sand to small pea-sized clusters.

Squeeze a few handfuls gently to create some larger crumbles, then refrigerate the streusel while you prepare the other layers. Keeping it cold helps the topping retain its crumbly texture.

Step 3: Prepare the custard and blueberries

In another bowl, whisk the 2 eggs with 1/4 cup granulated sugar and 1 tablespoon cornstarch until smooth. Whisk in the sour cream, 1/2 cup milk, and 1 teaspoon vanilla until no sour cream lumps remain. Set aside; give the mixture another brief whisk just before pouring it over the cake.

In a separate small bowl, gently toss the dried blueberries with 1 teaspoon cornstarch. This light coating helps thicken the juices released around the berries as they bake.

Step 4: Make the cake batter

Whisk together 1 1/4 cups flour, the baking powder, and 1/4 teaspoon salt in a small bowl.

Using a hand mixer or stand mixer fitted with the paddle attachment, beat the softened butter and 1/3 cup granulated sugar on medium speed for 3 minutes, until lighter in color and fluffy. Scrape down the bowl. Beat in the egg and 1 teaspoon vanilla until incorporated.

On low speed, add half the flour mixture, followed by the 1/3 cup milk, then the remaining flour mixture. Mix only until the flour disappears, finishing with a spatula if needed. The batter should be thick and spreadable rather than pourable.

Step 5: Briefly prebake the base

Spread the batter evenly in the prepared pan, making sure it reaches the corners. Smooth the surface with a small offset spatula or the back of a spoon.

Bake for 12 minutes. The surface should look lightly set, although the cake will still be pale and underbaked inside. This short prebake gives the custard a gentle foundation and helps keep the cake and creamy topping distinct.

Step 6: Add the blueberries, custard, and streusel

Remove the pan from the oven and place it on a heatproof surface, leaving the oven on. Scatter the blueberries evenly over the warm base without pressing them down.

Briefly whisk the custard again, then pour it slowly and evenly over the berries. Pour over the back of a large spoon if necessary to avoid disturbing the soft cake surface. The custard will settle between the berries, with some fruit remaining visible.

Sprinkle the cold streusel evenly across the top. Let the crumbs fall naturally rather than packing them down.

Step 7: Bake until golden and gently set

Return the pan to the oven and bake for about 48 minutes more, for a total oven time of approximately 1 hour. Begin checking after 42 minutes of this second bake, since ovens vary.

The streusel should be golden, the blueberry juices should bubble in a few places, and the custard should be set around the edges with only a slight wobble in the center. It should not ripple like liquid when you gently nudge the pan. For a more precise check, the custard in the center should register 175–180°F (79–82°C), with the thermometer tip positioned in the custard rather than a berry or the cake base.

If the topping browns before the center is ready, loosely cover the pan with foil. If the center still looks liquid, continue baking in 3-minute increments until it reaches the doneness cues above.

Step 8: Cool, slice, and serve

Place the pan on a wire rack and cool for 1 hour. The custard firms as it cools, so resist cutting into the cake straight from the oven.

For easier serving, cut into 9 squares directly in the pan. To lift out the whole cake, let it cool completely first, then support it from underneath while lifting with the parchment. Serve slightly warm, at room temperature, or chilled. For especially neat slices, refrigerate the cooled cake for 2 hours before cutting, wiping the knife between cuts.

Pro Tips

Measure flour gently: A kitchen scale is the most reliable option. If using cups, spoon the flour into the cup and level it rather than scooping directly from the bag.
Dry the berries well: Water clinging to freshly washed fruit can thin the custard and create soggy patches.
Keep the butter temperatures separate: Soft butter makes a tender, evenly mixed cake; cold butter makes distinct, crisp streusel crumbs.
Do not skip the short prebake: It helps prevent the custard from mixing into the cake batter.
Judge the custard, not just the topping: Golden crumbs can appear before the center is ready. Look for a gentle wobble rather than a wet slosh.

Variations

Lemon-blueberry kuchen: Beat 1 teaspoon finely grated lemon zest into the cake butter and sugar. Keep the vanilla in both layers.
Mixed-berry kuchen: Replace 1 cup of the blueberries with 1 cup fresh raspberries, using 300 g total fruit. Toss gently so the raspberries do not break apart.
Almond-vanilla custard: Use 3/4 teaspoon vanilla extract plus 1/4 teaspoon almond extract in the custard instead of its 1 teaspoon vanilla.

Storage & Make-Ahead

Refrigerate: Because this cake contains an egg-and-dairy custard, refrigerate it within 2 hours of leaving the oven. Once cooled, cover tightly and refrigerate for up to 4 days. The streusel will soften slightly during storage.

Make ahead: Prepare the streusel up to 2 days ahead and refrigerate it in an airtight container. You can also bake the entire cake 1 day ahead, cool it, and refrigerate it. Avoid assembling the unbaked layers ahead of time.

Reheat: Warm individual refrigerated squares in a 300°F (150°C) oven for 12 minutes, or until pleasantly warm. This helps refresh the streusel better than microwaving.

Freeze: Wrap fully cooled individual portions tightly, place in an airtight freezer container, and freeze for up to 1 month. Thaw overnight in the refrigerator. The custard may be a little less smooth after freezing.

Nutrition (per serving)

Estimated for 1 of 9 squares, including all streusel and the butter used to grease the pan.