Crumble Cake

A well-structured crumble cake is a study in balance — tender crumb, controlled aeration, defined fruit distribution, and a crisp, aromatic topping. This Blueberry Crumble Cake is built on a yogurt-enriched butter base that delivers moisture retention and delicate texture, finished with a high-temperature start to ensure proper lift and dome formation before settling into a gentle finishing bake.

The result is a cake with vertical rise, evenly suspended blueberries, and a golden, structured crust that slices cleanly without collapsing.

Crumble cakes evolved from Central European streuselkuchen traditions, particularly in Germany and Poland, where yeast-raised cakes were topped with butter crumbs. As baking powder became widespread in the 19th century, home bakers began adapting these into chemically leavened butter cakes — what North America later termed “coffee cake.”

What you will need:

Ingredient	Quantity
All-purpose flour	225 g
Granulated sugar	225 g
Unsalted butter, melted	102 g
Whole milk	75 g
Whole milk yogurt	80 g
Eggs	100 g
Baking powder	8 g
Fine salt	3 g
Vanilla extract	10 mL (2 tsp)
Fresh blueberries	180–220 g
Streusel	As needed

Equipments:

• Digital Scale
• 20–22 cm square pan or 23 cm round pan
• Parchment paper
• Mixing bowls (medium + large)
• Whisk
• Silicone spatula
• Offset spatula
• Oven thermometer
• Probe thermometer (recommended)

Time:

Preparation: 20 minutes
Baking: 13+35 minutes
Cooling: Minimum 45 minutes

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Instructions:

Preparation

• Preheat oven to 218°C.
• Line baking pan with parchment or grease lightly.
• Prepare the streusel and refrigerate.

Hydration Base

• Whisk milk and yogurt until smooth.
• Add eggs and whisk until fully homogenized.
• Incorporate vanilla extract.

Emulsification

• Add sugar and whisk until partially dissolved.
• Slowly stream in melted butter while whisking to maintain emulsion.

Dry Ingredients Addition

• Sift flour, baking powder, and salt together.
• Fold into wet mixture gently with spatula.
• Stop mixing once no visible dry flour remains.
• Fold in blueberries carefully to avoid crushing.
• Distribute evenly.

Assemble and Bake

• Spread batter evenly in prepared pan.
• Top evenly with chilled streusel and some fresh blueberries.
• Bake at 218°C for 13 minutes.
• Reduce temperature to 182°C and continue baking 35–40 minutes.
• Internal temperature should reach 96–98°C.
• Cool completely before slicing.

Variations to Try

Add lemon zest for brightness.
Replace 30 g flour with almond flour for nutty depth.
Incorporate white chocolate chips.
Swirl cream cheese mixture through batter before baking.

Serving Suggestions

Serve slightly warm with lightly whipped crème fraîche.
Dust with icing sugar just before service.
Pair with espresso, Darjeeling tea, or cold brew coffee.
Plate with lemon zest cream and fresh blueberries for elevated presentation.

Further Application

Adapt batter for muffin format (reduce baking time).
Bake in loaf pan at 175°C for extended time.
Use base for apple or raspberry crumble variations.
Layer horizontally and fill with mascarpone cream for celebration cake.

Nutrition Profile / 100g

Nutrition	Amount
Energy	372 kcal
Protein	5.2 g
Total Fat	15.8 g
Saturated Fat	9.4 g
Carbohydrates	53.1 g
Sugars	31.4 g
Fiber	1.2 g
Salt	0.48 g

Note: These values are approximate and can vary based on the specific brands and types of ingredients used, as well as portion sizes.

Tips for Best Results:

• Toss blueberries lightly in flour to prevent sinking.
• Do not overmix after adding flour — gluten development causes density.
• Yogurt improves shelf life by slowing moisture loss.
• Use room temperature eggs for better emulsification.
• If browning too quickly, tent loosely with foil after 30 minutes.
• Prepare the streusel first and chill while mixing batter to improve crumb structure.

Troubleshooting Guide:

Issue	Cause	Solution
Dense crumb	Overmixing	Fold gently and briefly
Sunken center	Underbaking	Verify internal temperature
Blueberries sinking	Thin batter	Light flour coating
Greasy top	Butter too hot during mixing	Cool butter slightly before use
Uneven rise	Oven fluctuation	Use oven thermometer

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