Works well with butterscotch or chocolate chip morsels. For gluten-free bars, use 260 grams of your favorite 1:1 gluten-free blend. I've tested with Pillsbury.
¾cupbutter or margarine, softened (salted or unsalted)(170 grams)
¾cuppacked light brown sugar(150 grams)
½cupgranulated sugar(100 grams)
2largeeggs
1teaspoonvanilla (optional, use only if using chocolate chips)
2cupsall-purpose flour, weigh or measure with a light hand(260 grams) or use 260 grams of a gluten-free blend
1teaspoonbaking soda
½teaspoonsalt or 1 scant teaspoon if using unsalted butter
1 ¾cupsor more semisweet chips or a big mix of chips(I rarely measure the chips)
1cupchopped nuts, toasted pecans or untoasted walnutsoptional
2regular Hershey Bars, broken into squares
Instructions
Heat oven to 350°F. and grease a 9x13 inch baking pan.
Beat butter, brown sugar and granulated sugar in large bowl until creamy. Add eggs; beat well.
Stir together flour, baking soda and salt; gradually add to butter mixture, beating until well blended. Stir in chips and nuts, if desired. Spread into prepared pan. .
Bake for about 25 minutes (may take longer, may be done sooner) or until top is golden brown and center is set.
Remove from oven and scatter Hershey Bar pieces over top. Return to oven for about 1 ½ minutes or until the bars are softened.
Cool completely in pan on wire rack. Cut into bars.