1 pkg. Duncan Hines yellow or lemon cake mix (DO NOT use a cake mix with pudding in it)
1 c. packed brown sugar
3/4 c. chopped walnuts
1/4 c. firm butter
3 eggs
1 1/2 c. sour cream (12 oz.)

Mix 2/3 cup of the dry cake mix, the brown sugar, walnuts, and butter until crumbly; set aside. Beat eggs slightly with fork; blend with sour cream. Mix in the remaining cake mix. (Batter will be thick and slightly lumpy.) Spread half of the batter in greased 9 x 13 inch pan; sprinkle half of the sugar mixture over batter. Spoon and gently spread remaining batter in pan; sprinkle with remaining sugar. Bake 40 to 45 minutes at 350 degrees.