Step 1

Preheat oven to 350°F.

Step 2

Lighty grease a 9"x13" inch baking dish with cooking spray; set aside.

Step 3

Remove 2/3 cup of cake mix straight from the box and combine with melted butter, brown sugar and chopped nuts; set aside.

Step 4

In a medium bowl, combine remaining cake mix with the room temperature eggs and sour cream, mixing with a wooden spoon until batter is smooth. Pour half into prepared pan. Top with half of the crumb mixture. Repeat layers.

Step 5

Bake for 45 minutes to 1 hour, checking for doneness after 45 minutes, until toothpick inserted into center comes out clean.