Cake Mix Cinnamon Walnut Coffee Cake

"A quick and delicious coffee cake that starts with a cake mix! You start out with your basic white cake mix and add just a few simple ingredients to it. It's then topped with a quite amazing cinnamon and walnut topping. Sweet, with a little crunch. It's light, fluffy and super moist. So good! Here is what you need for this recipe: 1 package white cake mix egg light plain, Greek yogurt (or sour cream) butter, melted vanilla flour ground cinnamon brown sugar butter, melted chopped walnuts"

Preparation Time15 min

Cooking Time30 min

Cooking Vessel Size9 x 13 baking dish