Ingredients
3/4 cup butter, softened
3/4 cup packed brown sugar
1 large egg yolk, room temperature
3/4 teaspoon vanilla extract
1-1/2 cups all-purpose flour
FILLING
1 package fudge brownie mix (13x9-inch pan size)
1/3 cup water
1/3 cup canola oil
1 large egg, room temperature
TOPPING
1 package (11-1/2 ounces) milk chocolate chips, melted
3/4 cup chopped salted roasted pistachios
Directions
1. Preheat oven to 350°. In a large bowl, cream butter and brown sugar until light and fluffy. Beat in egg yolk and vanilla. Gradually beat in flour, mixing well. Press onto bottom of a greased 15x10x1-in. baking pan.
2. Bake until golden brown, 12-14 minutes. Meanwhile, in a large bowl, combine brownie mix, water, oil and egg until blended.
3. Spread brownie batter over hot crust. Bake until center is set, 14-16 minutes. Cool completely in pan on a wire rack.
4. Spread melted chocolate over top; sprinkle with pistachios. Let stand until set. Cut into 36 bars.
