• Preheat oven to 350℉.
• Grease a brownie pan with butter or shortening

Cookie Layer

• In a stand mixer, cream shortening and brown sugar until smooth and creamy, about 5 minutes.
• Beat in egg, milk, and vanilla extract.
• Stir in flour and baking soda on low speed until just combined.
• Fold in chocolate chips.
• Press even amounts of cookie dough into bottoms of the brownie pan sections.

Brownie Layer

• Whisk together sugar, cocoa powder, flour, and baking soda in a medium-sized bowl.
• Add eggs and vanilla extract, stirring to combine. Dough will be dry and chunky.
• Add melted butter and stir until combined.
• Spoon brownie batter evenly over cookie layer in prepared pans.
• Bake in preheated oven for 22-25 minutes or until the brownie layer is baked through but still soft.
• Allow to cool in pan for 5 minutes before removing bars from pan to cool on a rack.
• Store cooled bars in an air tight container for up to three days.