Chocolate Peanut Butter "Revel Bars"

From the time I first saw this recipe, I knew I had to make these bars.  In my mind, you can't go wrong with the combination of peanut butter and chocolate.  We clearly love the combo...
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Chocolate Peanut Butter Revel Bars
Source: Blue-Eyed Bakers

Chocolate Peanut Butter Revel Bars
14 tablespoons (1 3/4 sticks) butter, softened
2 cups brown sugar, packed
1 teaspoon baking soda
2 eggs
2 teaspoons vanilla
2 1/2 cups flour
3 cups quick cooking oats

For Filling:
1 1/2 cups semisweet chocolate chips
1 14-ounce can sweetened condensed milk
1/2 cup peanut butter
1/2 cup peanuts, chopped
2 teaspoons vanilla

Directions
Preheat oven to 350 degrees F.  Line a 9 x 13 baking pan with foil and set aside.

In the bowl of an electric mixer, beat butter, brown sugar and baking soda together until creamy. Add in eggs and 2 teaspoons of vanilla until combined.

With the mixer on low, add in the flour and mix until completely incorporated, scarping down sides of bowl as you go.  Add in the rolled oats (you may need to use a little elbow grease to mix them in).  Set dough aside.

For the filling, combine peanut butter, chocolate and sweetened condensed milk in a microwave safe bowl.  Heat mixture in microwave, stirring every 20 seconds, until chocolate is melted.  Stir unril smooth, then add peanuts and 2 teaspoons vanilla.

Press about two-thirds of the oat mixture into the baking pan. Spread chocolate filling evenly over the oats mixture.  Dot the remaining oat mixture over the top of the chocolate.

Bake 22-25 minutes, until top is lightly browned.  The chocolate may still look moist.  Allow bars to cool completely on a wire rack.