Preheat oven to 350 degrees (F) while you prepare the pumpkin coffee cake batter.
Start the dry ingredients. In a large bowl, add flour, baking powder, baking soda, salt and pumpkin spices. Whisk until smooth.
In another bowl, mix the wet ingredients. Start by whisking brown sugar and canola oil until fully incorporated. Then add the pumpkin puree, eggs, sour cream and vanilla extract. Whisk until smooth.
Fold the wet ingredients into the dry ingredients. Using a spatula or whisk, slowly mix the wet ingredients, in small batches. Make sure to not over mix.
Grease and flour a baking dish. Using an 8x8 baking dish, pour the coffee cake batter and smooth. Add to oven and partial bake for 15 minutes.
Remove cake and top with streusel crumb topping. Spread evenly on top and bake for remaining time. Once done, remove the cake from the oven and cool for 15-20 minutes.
Quickly prepare the optional maple glaze. Incorporate powdered sugar, maple syrup and water in a bowl. Whisk vigorously until glaze is smooth, shiny and creates thin ribbons.
Drizzle maple glaze over the cooled pumpkin coffee cake. Allow to dry and serve with hot coffee. Enjoy!