Pre-heat the oven to 350 degrees. Line a 9” x 13” pan in both directions with parchment paper, leaving an overhang.
Beat the butter with 1 cup of the brown sugar till light and fluffy. Scrape down the sides. Add 1 whole egg and 2 yolks (do not discard the whites!), along with the vanilla extract and beat again. Scrape down the sides. Add the flour, baking powder, salt and Spicy Baking Blend, and beat till just combined.
Scrape the batter into your prepared pan and use a small angled spatula to smooth into an even layer. Clean and dry the mixer bowl.
Spread the cranberry curd over the cookie dough.
Beat the 2 reserved egg whites on low speed till the surface is covered in bubbles. Raise the speed to medium high and gradually add the remaining 1 cup of brown sugar. Raise the speed to high and beat till stiff peaks form. Dollop the meringue over the cranberry curd and gently spread evenly.
Bake for 30 minutes and cool completely on a wire rack. Use the parchment “sling” to transfer the bar to a cutting board and cut into 24 squares.