Heat oven to 350 degrees. Generously grease and flour 9 x 13 pan. Mix crumbs, nuts brown sugar, cinnamon, and butter; reserve. Blend cake mix, water, oil and eggs on low speed until moistened, about 30 seconds. Beat on medium speed, stirring, occasionally, 3 minutes. Pour ½ batter (about 2 1/3 cups) into pan; sprinkle with ½ of the reserved crumb mixture. Spread remaining batter evenly over crumb mixture; sprinkle with remaining crumb mixture. Bake until wooden pick inserted in center comes out clean, 45 to 50 minutes; cool. Drizzle cake with Vanilla Glaze.

Mix 1 cup powdered sugar to 1 to 2 tablespoons water until desired consistency.