Preheat oven to 350°F with rack in middle. Line bottom and sides of a 9-inch square baking pan with heavy-duty foil, leaving an overhang on 2 sides. Butter bottom and sides of pan, then dust with flour, knocking out excess.
Make streusel topping: Stir together flour, sugars, cinnamon, and a pinch of salt in a large bowl. Blend in butter with your fingertips or a pastry blender until mixture forms large clumps.
Make cake: Whisk together flour, baking powder, baking soda, and salt in a bowl.
Stir together sour cream and vanilla in a small bowl.
Beat together butter and sugar in a large bowl with an electric mixer at medium-high speed until pale and fluffy, about 5 minutes. Add egg and beat until well blended.
At low speed, mix in flour mixture in 3 batches, alternating with sour-cream mixture and mixing until just combined.
Gently fold in blueberries.
Spoon batter into pan, smoothing top (preferably with an offset spatula). Crumble half of topping evenly over batter.
Bake 25 minutes, then remove from oven and crumble remaining topping evenly over cake. Bake until a wooden pick inserted into center comes out clean, about 25 minutes more. Cool in pan 10 minutes. Lift out cake using foil and cool completely on rack.
Cooks' note: Cake can be made 1 day ahead and kept, well wrapped in plastic wrap, at room temperature.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	2850.07 Kcal (11933 kJ)
Calories from fat	1005.3 Kcal
		% Daily Value*
Total Fat	111.7g	172%
Cholesterol	469.2mg	156%
Sodium	1659.8mg	69%
Potassium	1500.64mg	32%
Total Carbs	428.68g	143%
Sugars	206.95g	828%
Dietary Fiber	18.25g	73%
Protein	42.12g	84%
Vitamin C	49.3mg	82%
Vitamin A	1.1mg	38%
Iron	4.1mg	23%
Calcium	525.8mg	53%

Amount Per 100 g
Calories	241 Kcal (1009 kJ)
Calories from fat	85.01 Kcal
		% Daily Value*
Total Fat	9.45g	172%
Cholesterol	39.68mg	156%
Sodium	140.35mg	69%
Potassium	126.89mg	32%
Total Carbs	36.25g	143%
Sugars	17.5g	828%
Dietary Fiber	1.54g	73%
Protein	3.56g	84%
Vitamin C	4.2mg	82%
Vitamin A	0.1mg	38%
Iron	0.3mg	23%
Calcium	44.5mg	53%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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