Mix together brown sugar, walnuts, pecans, flour, butter, and cinnamon for the topping in a bowl until crumbly; set aside.
Preheat the oven to 375 degrees F (190 degrees C). Spray a fluted tube pan (such as Bundt®) with cooking spray.
Combine sugar, yogurt, butter, eggs, milk, baking powder, and salt for the cake in a large bowl; beat with an electric mixer until smooth. Slowly mix in flour until combined; batter will be thick. Pour 1/2 of the batter into the bottom of the prepared pan. Generously spread 1/2 of the brown sugar-cinnamon topping over top. Top with remaining batter and then remaining topping.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, 45 to 50 minutes. Cool on a wire rack for 5 minutes. Run a table knife around the edges to loosen. Invert carefully onto a cooling rack, then place brown sugar-cinnamon side up on a plate to serve.
Nutritional Facts
Per 12 servings
Calories: 518
Carbohydrate: 73g
Fat: 23g
Fiber: 2g
Protein: 7g
Sugar: 45g
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