Line two 12x17-inch baking sheets with parchment paper and set aside.
Whisk together 2 cups all-purpose flour, 2 cups cake flour, 2 tablespoons malted milk powder, 1 tablespoon corn starch, 1 teaspoons salt, and ½ teaspoons baking soda in a medium bowl. Set aside.
In a stand mixer fitted with a paddle attachment, cream together 1¼ cups cold salted butter, 1⅓ cups light brown sugar, and ½ cup granulated sugar. Mix at medium-high speed until smooth, about 3 to 4 minutes, scraping down the sides of the bowl about every minute, if needed.
Once combined, add in the 2 large eggs one at a time, mixing between each addition, followed by the 3 additional large egg yolks. Mix until completely incorporated and scrape down the sides of the bowl. Then mix in the 1 tablespoon vanilla bean paste.
Once smooth, mix in the flour mixture a little at a time until fully combined. I highly recommend mixing just until mostly combined in a stand mixer, then using your hands to give the dough some love and mix it the rest of the way, ensuring all the dry ingredients at the bottom of the bowl are thoroughly incorporated.
Add 8 ounces white chocolate to a food processor and pulse until small pieces form. Add the white chocolate along with 1½ cups white chocolate chips to the cookie dough, but don't mix in yet.
Add 12 ounces craisins to the food processor (no need to clean in between) and pulse until small bits form. Add to the dough and mix until evenly combined.
Use a #16 cookie scoop or weigh each dough ball out to 3.2oz and place on a parchment-lined baking sheet.
Use the bottom of a cup to press the ball flat, about ½ to ¾-inch thick, and refrigerate for 15 minutes. Meanwhile, preheat the oven to 350°F.
After chilling, Bake for 11 to 14 minutes.
Optional: Use a large round cookie cutter to swirl each of the cookies inside to smooth out the edges.
Allow them to sit on the pan for a few minutes before transferring to a wire rack to cool.
Once cooled, melt 20 ounces white chocolate melting wafers in a microwave-safe bowl at 30-second intervals, stirring between each one until fully melted.
Spread the melted white chocolate over the top of the cookies. Immediately top with coarse sugar and Sparkling Cranberries if using.