Lightly grease a 9x9 baking pan with nonstick cooking spray and line with parchment paper.
Make the cookie dough layer by using a hand mixer to cream together 1/2 cup salted butter and 3/4 cup brown sugar in a mixing bowl. Mix in 1/4 teaspoon salt and 1 teaspoon vanilla extract. Slowly mix in 2 cups all-purpose flour and 14 ounces sweetened condensed milk, alternating between the two. Stir in 2 cups mini chocolate chips. Press the dough into the prepared baking pan.
Make the peanut butter layer by using a hand mixer to cream together 1 cup creamy peanut butter and 1/2 cup powdered sugar in a mixing bowl. Gently spread the peanut butter mixture over the cookie dough layer.
Make the chocolate layer by pouring 12 ounces milk chocolate chips into a microwave safe bowl. For a softer chocolate layer, pour in 1/2 cup heavy cream (optional). Microwave 15 seconds at a time, stirring in between, until chocolate is smooth and melted. Pour over peanut butter layer immediately and smooth out with a rubber spatula.
Refrigerate for 4 hours before slicing and serving.
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Notes
If you are concerned about consuming raw flour you can toast the flour prior to using it in the recipe. Simply place the flour into a skillet over medium heat and toast for 3 to 5 minutes. Use the toasted flour in the recipe as directed.