Preheat oven to 400 degrees, and generously grease sheet pan.
To make the pancakes, in a large mixing bowl, whisk together the oat flour, baking soda, spices, and salt.
Then, add the pumpkin puree, milk, eggs, vanilla, and apple cider vinegar. Whisk until the mixture is well combined.
Now pour the batter into the pan, and spread it evenly using a spatula.
To prepare the streusel topping, in a medium mixing bowl, stir together all of the topping ingredients.
Sprinkle the streusel evenly across the top of the pancake batter.
Place the pan in the oven and bake for 20 minutes or until a toothpick inserted in the center comes out clean.
Serve warm with your favorite toppings!