Preheat oven to 350* and grease a 10" cast iron skillet with vegan butter or coconut oil.
In a small bowl, combine flax, water, instant coffee and vanilla. Stir and set aside.
2 tablespoon Ground Flax Seed, 6 tablespoon Water, 2 teaspoon Instant Coffee Granules, 2 teaspoon Vanilla Extract
In a large bowl with a wooden spoon or a spatula, cream the vegan butter and bornw sugar until well combined and fluffy.
8 tablespoon Vegan Butter, 1 Cup Light Brown Sugar, tightly packed
Add the flax mixture into the bowl and stir until well combined.
Add the cocoa powder and stir until almost combined, then add the flour, baking powder and salt and stir just until the dough forms.
½ Cup Dutch Processed Cocoa Powder, sifted, 1 ½ Cups All-Purpose Flour, 2 teaspoon Baking Powder, ½ teaspoon Kosher Salt
Add the white chocolate chips and 1 cup of the chopped Oreos (reserve some for the top) and stir to distribute.
½ Cup Vegan White Chocolate Chips, 12 Oreos Roughly Chopped, divided
Scrape the dough into a greased cast iron skillet and press the dough evenly into the skillet.
Add the remaining chopped Oreos to the top and gently press them into the dough.
12 Oreos Roughly Chopped, divided
Bake for 23-25 minutes, or until the edges of the cookie are set.
Allow to cool slightly before serving.