Heat oven to 350°F. Lightly grease a 8x8-inch baking pan.
Empty contents of cinnamon crumb topping pouch into small bowl. Add 1/2 teaspoon pumpkin pie spice and stir to combine. Set aside.
In a medium bowl, whisk together coffee, oil, egg, and pumpkin until blended.
Add Krusteaz Cinnamon Crumb Cake Mix and 1/2 teaspoon pumpkin pie spice. Stir until well combined.
Spoon half of batter into pan and spread evenly. Sprinkle half of topping mixture over batter.
Drop remaining batter in small spoonfuls over topping layer and spread to edge of pan. Sprinkle remaining topping evenly over batter.
Bake for 44-50 minutes or until a toothpick inserted into center comes out clean. For a glass pan, add 5 minutes to bake time. Allow to cool for 5-10 minutes.
For Glaze: Whisk all ingredients together until smooth. Add more milk (or cream) if necessary for desired consistency. Drizzle over coffee cake and let set before cutting and serving.