INGREDIENTS
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For the cake:
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2 Tbsp sugar
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2 Tbsp plain yogurt
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1 egg white
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2 1/2 Tbsp flour
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1/8 tsp baking powder
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1/8 tsp salt
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1/4 tsp vanilla
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For the streusel:
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2 Tbsp butter, cut into small cubes
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2 Tbsp brown sugar
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1 Tbsp flour
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1/2 tsp cinnamon