Preheat oven to 350 F. Line baking sheets with parchment paper and set aside.
You'll make the brownie cookie batter first. Start by melting the butter and chocolate together in the microwave. I start with 30 seconds and then stir, continue in 15 second intervals until melted.
Whisk together the baking powder, salt, flour and cocoa powder. Set aside.
In a medium mixing bowl, mix together the melted butter chocolate with both sugars, eggs and vanilla until lighter in color and all combined.
Mix the dry ingredients into the wet ingredients. Set aside while you make the peppermint cookie dough.
In another medium bowl whisk together melted butter and both sugars. Add in the egg, peppermint extract and vanilla, mix until combined.
Stir in the salt, baking soda and flour. Fold in the white chocolate chips and peppermint candies.
Using a ¼ cup cookie scoop, scoop about ⅓ of the peppermint cookie dough into the bottom of the cookie scoop.
Fill the rest of the cookie scoop with the brownie dough.
Place 5-6 cookie balls onto the parchment lined cookie sheet. Sprinkle with coarse sugar.
Bake for 11-13 minutes, or until a light golden brown. As soon as you pull them out of the oven sprinkle with flaked salt. Allow to cool.