Streusel Coffee Cake

Streusel Coffee Cake
1 1/2 c. graham cracker crumbs (about 21 crackers)
3/4 c. chopped pecans
3/4 c. packed brown sugar
1 1/2 t. cinnamon
2/3 c. butter, melted
1 pkg. yellow cake mix
1 c. water
1/4 c. cooking oil
3 eggs
powdered sugar icing
For streusel: Combine cracker crumbs, pecans, brown sugar and cinnamon. Stir in melted butter. Set aside.
In large mixing bowl, combine cake mix, water, oil, & eggs. Beat on low speed until moistened. Beat on medium speed for 1 1/2 minutes. Pour half of the batter into a greased 13x9x2" baking pan. Sprinkle with half of the streusel mix. Carefully spread remaining batter over streusel; sprinkle with remaining streusel mix. Bake in 350 oven for 35- 40 minutes until toothpick comes out clean. Cool slightly; drizzle with Powdered Sugar Icing
Powdered Sugar Icing
Combine 1 c. powdered sugar, 1 t. vanilla, and enough water to make a drizzling consistency.