Preheat oven to 350 F. Line a 13x9 baking pan with foil, spray the foil with cooking spray.
In mixing bowl, beat the butter until creamy. Add the brown sugar and beat until well combined. Beat in the eggs, one at a time, until combined. Add 2 cups peanut butter and 2 teaspoons of vanilla; beat until combined.
In a separate bowl, whisk together the flour, baking soda and salt. Turn mixture down to low and gradually add in the flour mixture until completely combined and dough comes together.
To make the filling, heat the sweetened condensed milk, chocolate chips and 2 tablespoons peanut butter, stirring occasionally, in a heavy saucepan over low heat until melted and creamy. Remove from heat and add the 2 teaspoons of vanilla.
Measure out 2 cups of the peanut butter dough and set it aside for the topping.
Press the remaining dough into the prepared pan. Spread the chocolate filing over the dough in the pan. Crumble the reserved dough over the top of the filling. Sprinkle with miniature chocolate chips.
Bake for 30 minutes or until topping is light golden brown. Cool in the pan on a wire rack.
Using the foil as handles, lift out of the pan and place on a cutting board. Cut into bars.
This recipe for Peanut Butter Chocolate Layer Bars was printed from AmandasCookin.com - https://amandascookin.com/peanut-butter-chocolate-layer-bars/ and can only be printed for education or personal use.