Peanut Butter Bars {just like Reese's PB cups}

• These are super yummy, super easy, and truly taste just like a Reese's Peanut Butter cup! {Seriously they do!}
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• 1 cup butter or margarine, melted (I used 1 1/2 cup the second time I made these and it was just fine!)
• 2 cups graham cracker crumbs
• 2 cups confectioners' sugar
• 1 cup peanut butter
• 1 1/2 cups milk chocolate chips
• 4 tablespoons peanut butter
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• In a medium bowl, mix together the butter or margarine, graham cracker crumbs, confectioners' sugar, and 1 cup peanut butter until well blended. Press evenly into the bottom of a 9x13 inch pan and refrigerate for 2 hours.  In the microwave, melt the chocolate chips with the peanut butter, stirring occasionally until smooth. Spread over the prepared crust. Refrigerate for at least one hour before cutting into squares.