Preheat oven to 350 degrees F. Line a large baking sheet with a Silpat baking mat or parchment paper and set aside.
In a medium bowl, whisk together flour, baking powder, baking soda, and sea salt. Set aside.
Using a stand mixer, cream butter and sugars together for about 1 minute. Add in the eggs and vanilla and mix until combined. With the mixer on low, slowly add in the dry ingredients. Stir in 1 1/2 cups chopped peppermint bark and chocolate chips.
Form the cookie dough into balls, about 2 tablespoons of dough. Place on prepared baking sheet, about 2 inches apart. Sprinkle with flaked sea salt.
Bake cookies for 10-12 minutes or until the edges are slightly golden brown. Remove from oven and let cookies cool on the baking sheet for 2-3 minutes. While the cookies are cooling on the baking sheet, Gently push the remaining 1/2 cup of peppermint bark chunks into the tops of the cookies for decoration. Transfer cookies to a wire cooling rack and cool completely.
Notes
Store the cookies on the counter in an airtight container for up to 3 days.