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Preheat oven to 350°F. For the Topping, mix flour, sugar and cinnamon in medium bowl. Add melted butter; toss with spatula until large crumbs form. Stir in nuts. Set aside.
For the Cake, beat cake mix, egg, sour cream, butter and vanilla in large bowl with electric mixer on medium speed about 1 minute or just until mixed.
Spread evenly in greased and floured 13x9-inch baking pan. Sprinkle with topping mixture.
Bake 25 to 30 minutes or until cake pulls away from sides of pan. Cool on wire rack.
My son LOVED LOVED LOVED this!!! Easy to make, moist :) YUM
Nean | November 27, 2013
Easy to make and if you keep a couple of cake mixes around it's even easier. I tweaked it a little bit for our tastes here. I added 1 more egg as the ones I had on hand were small and I added more brown sugar to the crumble mix. As it turns out the crumble still needs a little something. I will use a white sugar based one from somewhere else and hope to get better results
Lisa | October 17, 2015
The topping in not crumbly with that amount of butter to flour/sugar. It's a paste. Someone needs to check the amounts perhaps? Cook time is way too long too. 20-22 is good. The first one I baked was way over overcooked. Tastes nice though....
Nikki | May 19, 2014