• Preheat the oven to 350 degrees F. Spray an 8x8-inch pan with nonstick spray. Line the bottom of the pan with a strip of parchment paper, so that it comes up two of the sides that are opposite each other. Spray the parchment with nonstick spray too.

PREPARE THE BROWNIE LAYER:

• In a small bowl, melt the butter and unsweetened chocolate in the microwave until the butter is melted, about 2 minutes. Stir briskly until well-combined, then stir in the vanilla. Meanwhile, in a large bowl- use an electric mixer to beat together the sugar and eggs. Scrape in the partially cooled chocolate mixture and mix to combine. In separate medium bowl, whisk together flour, baking powder and salt. Stir the flour ingredients and chocolate chips into the wet ingredients. Spread the batter into the prepared pan. Bake 22 to 28 minutes, or until a toothpick inserted into the center of the brownies comes out clean. Remove from the oven and let cool.

PREPARE THE COOKIE DOUGH LAYER:

• In a large bowl, use an electric mixer to combine butter and brown sugar. Mix until creamy. Add milk and peanut butter and mix to combine. Stir in the flour and salt. Spread the peanut butter cookie dough in an even layer over the cooled brownies.

PREPARE THE GANACHE LAYER:

• In a small bowl, microwave the chocolate chips, cream and sugar for 1 minute, stirring after 30 seconds. Continue to microwave in 30 second bursts, stirring after each heating time. Continue heating and stirring until the chocolate is melted and the mixture is smooth. Drizzle the ganache over the peanut butter cookie dough layer and carefully spread to cover the top. Sprinkle with peanut butter chips. Refrigerate until the dough and the ganache topping are set (at least 1 hour). Use a knife to loosen the sides, then carefully grab the parchment paper and remove the whole pan of brownies to a cutting board. Use a sharp knife to cut them into squares. Keep refrigerated until ready to serve.