Preheat oven to 350°F (175°C). Grease a 9×9-inch baking dish.
In a large bowl, cream together the butter and granulated sugar until light and fluffy. Add eggs, one at a time, beating well after each addition.
Mix in yogurt and vanilla extract until combined.
In another bowl, whisk together whole wheat flour, all-purpose flour, baking powder, baking soda, salt, and cinnamon.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Do not overmix.
Pour the batter into the prepared baking dish and spread evenly.
In a small bowl, mix together brown sugar, whole wheat flour, and cinnamon for the streusel topping. Pour in melted butter and mix until crumbly.
Sprinkle the streusel topping evenly over the batter.
Bake for 35-40 minutes, or until a toothpick inserted into the center comes out clean.
Let cool slightly before slicing and serving.
Prep Time: 15 minutes | Cooking Time: 40 minutes | Total Time: 55 minutes
Kcal: 320 kcal | Servings: 9 servings
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