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Preheat the oven to 350 degrees. Line a 9x13 pan with parchment paper and set aside.
Combine the butter and sugar in a mixing bowl. Mix until combined and slightly fluffy, about 2 minutes.
Scrape the sides of the bowl and add the eggs, egg yolk, and vanilla. Continue to mix until fully incorporated, about 1 minute.
In a separate bowl, whisk together the flour, cornstarch, baking powder, salt, cinnamon, and nutmeg.
Stir the dry ingredients into the wet ingredients until just combined.
Spread the batter into the prepared pan.
Combine 1 tablespoon of sugar with 1 tablespoon of cinnamon. Sprinkle evenly over the top of the batter.
Bake 25-30 minutes or until a toothpick inserted in the center comes out clean.
Cool and enjoy.