Preheat the oven to 350° F.
Line a 15x10x1-inch baking sheet with parchment paper and spray with non-stick cooking spray. Set aside.
Add the flour, ground oats, brown sugar, ginger, nutmeg, cinnamon, cloves, allspice, and baking powder to a large mixing bowl and whisk to combine.
Add the eggs, milk, oil, and molasses to the mixing bowl and whisk until well combined and smooth.
Pour the batter onto the prepared baking sheet and spread the batter out evenly with a rubber spatula.
Bake in the preheated oven for 15 minutes or until a toothpick inserted in the center comes out clean.
Cut into squares and serve immediately with whipped cream and maple syrup.