Preheat the oven to 350 degrees Fahrenheit and grease a 9x13 baking dish with non-stick cooking spray.
In a large mixing bowl, add the brown sugar, oil, eggs and vanilla extract and beat with an electric mixer until smooth.
1 cup light brown sugar, ½ cup canola oil, 2 eggs, 1 teaspoon vanilla extract
Add the flour, baking soda, cinnamon, and nutmeg to the batter and mix until just barely combined. (be careful not to over mix. (the batter will be thick).
Add in the applesauce mix until incorporated, scrape down the sides of the bowl with a spatula and mix again in needed.
1 cup unsweetened applesauce
Pour the batter into the baking dish.
Make the crumb topping.
In a medium mixing bowl, add all of the topping ingredients and mix together. I use my hands to work the butter well and all the ingredients are moistened.
¾ cup quick oats, ¾ cup all-purpose flour, ⅓ cup light brown sugar, 5 tablespoons unsalted butter, ½ teaspoon cinnamon
Sprinkle the topping all over the batter evenly.
Bake for 35-40 minutes or until a toothpick inserted into the center comes out clean. .
Notes
Add chopped walnuts or pecans to the crumb topping.Add ½ cup of raisins to the batter.Sprinkle cooled cake with powdered sugar. Store in an airtight container or covered with foil or plastic wrap for up to 5 days.You can also store in the refrigerator and pop it in the microwave for 15 seconds to warm it slightly.Freeze individual slices. Wrap each slice in plastic wrap and place the slices in airtight container or plastic freezer bag.