Mix dry ingredients: In a large bowl, whisk together the dry ingredients, until blended.
3 1/4 cups all-purpose flour, 1 cup granulated sugar, 1 small box sugar free vanilla pudding, 2 1/2 tsp baking powder, 1/2 tsp kosher salt, 1/2 tsp cinnamon
Mix wet ingredients: In another bowl, whisk together the wet ingredients, until blended.
3 eggs, 1 1/2 cups milk, 1/2 cup oil, 1/4 cup maple syrup, 1 tsp vanilla
Combine: Pour the wet ingredients into the dry ingredients and fold together with a rubber spatula, until blended.
Prep: Butter a 13x9 pan. Pour the cake batter into the pan.
Make topping: In a small bowl, combine the oatmeal topping ingredients, until blended. Spoon the oatmeal topping on the cake batter, covering as much of the batter as possible.
6 tbls butter, room temperature, 1 cup oats, 1/4 cup flour, 1/4 cup maple syrup, 1/4 cup brown sugar, 1/2 tsp cinnamon
Assemble: Bake in a 400F degree oven for 15 minutes. Remove from oven and drizzle with maple syrup.
More maple syrup for drizzle
Bake: Return to oven and bake for 20 minutes.
Serve: Serve warm.