Peanut Butter Chocolate Chunk Cookie Bars

INGREDIENTS

1/2 cup

unsalted butter, melted (1 stick)

large egg

3/4 cup

light brown sugar, packed

1/4 cup

granulated sugar

1 tbsp

vanilla extract

heaping 1/2 cup creamy peanut butter (like Jif or Skippy, do not use homemade)

1 1/4 cups

all purpose flour

1/2 tsp

baking soda

salt, optional and to taste

to 7 ounces dark or semi-sweet chocolate, roughly chopped (I used Trader Joe’s Dark Chocolate Pound Plus Bar, 54%)