• Preheat the oven to 350 degrees, line an 8x8 glass baking dish with foil, then lightly spray with non-stick spray. Set aside,

First, make the brownie layer:

• In a large bowl, add the sugar, flour, cocoa powder, salt, baking powder, and chocolate chips. Use a spatula to mix until well combined.
  1 cup sugar, ½ cup flour, ⅓ cup cocoa powder, ½ teaspoon salt, ¼ teaspoon baking powder, ½ cup chocolate chips
• In a measuring cup, add in the oil then eggs, and vanilla. Mix up the wet ingredients with a fork.
  2 eggs, ½ cup vegetable oil, 1 teaspoon vanilla extract
• Pour the wet ingredients into the dry ingredients and stir with the spatula until just combined.
• Spread the mixture into the prepared baking dish and set aside.

Now make the peanut butter cookie:

• To a large mixing bowl, add the butter and sugars and whisk until light and fully combined.
  2 Tablespoons unsalted butter, 2 Tablespoons sugar, 2 Tablespoons brown sugar
• Add in the whisked egg and vanilla and combine.
  2 Tablespoons beaten egg, ½ teaspoon vanilla extract
• Add in the peanut butter and stir with a spatula.
  2 Tablespoons peanut butter
• Add in the flour, baking soda, and salt, and mix until fully combined.
  ½ cup flour, ¼ teaspoon baking soda, ¼ teaspoon salt
• Use your hands to flatten pieces of the dough and lay on top of the brownie layer. Fit the pieces together, like a puzzle, until you have a fairly even layer covering the brownie batter.
• Bake for 40-45 minutes or until the cookie layer is golden brown and a toothpick inserted in the center comes out clean.
• Let cool for 20 minutes then lift out the foil and cut into bars.