Preheat oven to 350°.

Line a baking sheet with parchment paper.

In bowl of stand mixer, beat butter until smooth and then add brown sugar. Beat them together for 2 minutes on medium speed, scraping the sides down as needed.

Next add the eggs and vanilla, mixing until smooth.

Beat in the baking powder, baking soda and salt.

Turn mixer to low and add in the flour until incorporated.

Stir in both chocolates.

Form about 1/4 cup of cookie dough into a balls and place on baking sheet about 2 1/2 inches apart.

Place remaining dough in the refrigerator until ready to bake.

Bake for 9-10 minutes until edges are golden. Tops of cookies might seem undercooked.

Remove from oven and allow the cookies to cool on cookie sheet for 5 minutes, then transfer to a wire rack to continue cooling.

Repeat with remaining dough.