1 cup flour
Preheat oven to 350 F. Line a 9 x 9 baking pan with parchment or foil. In a food processor, combine 1 cup flour, brown sugar and 1/2 cup butter. Pulse until mixture resembles coarse crumbs. Pour dough into a bowl and mix in 1/4 cup chocolate chips. Press dough into pan and bake for 8 minutes.
While the shortbread is baking, combine sugar, 3/4 cup flour, cocoa powder, baking powder and salt in a large bowl and stir to combine. Add eggs, melted butter, and vanilla and mix until blended. Add in 1/2 cup chocolate chips and pour mixture over shortbread.
Bake brownies for 35-40 minutes. Cool in baking pan on a wire rack. Once cooled, use foil or parchment to life the brownies out of the pan. Cut and enjoy!