Spray a 9x13 pan with cooking spray. Preheat the oven to 350º Fahrenheit.
In a mixing bowl, beat together the cake mix, eggs, oil, water, vanilla and sour cream. Mix for about 2 minutes, scraping the sides of the bowl as needed. Set aside.
In a small bowl, mix together the brown sugar, pecans and cinnamon.
Pour half of the cake batter in the prepared pan.
Sprinkle half of the sugar mixture over the batter.
Spread the remaining cake batter in the pan, then top with the remaining streusel.
Gently swirl the batter with a knife.
Bake for 30-35 minutes or until the cake tests done.
To make the glaze, whisk together the powdered sugar, cream and vanilla extract until you have a drizzling consistency. Add a tablespoon or two more cream if needed.
Drizzle the glaze over the warm cake.
Serve with ice cream if desired. It’s excellent with cinnamon or even caramel based ice cream!
The calories shown are based on the cake being cut into 15 pieces, with 1 serving being 1 slice of cake. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**