Bakery Style Chewy Chocolate Chip Cookies

Ingredients:...
2 cups all-purpose flour (280 gms)
2 tablespoons all-purpose flour (20 gms)...
1⁄2 teaspoon baking powder
1⁄2 teaspoon salt
3⁄4 cup unsalted butter, melted and cooled until warm (170 gms)
1 cup brown sugar (packed, light or dark, 236 gms)
1⁄2 cup granulated sugar
1 large egg
1 large egg yolk, from a large egg
2 teaspoons vanilla extract
1 1⁄2 cups chocolate chips (semi-sweet, milk chocolate or any combination, 300 gms)
1 cup walnuts (114 gms, chopped) (optional)

DIRECTIONS

Place oven racks in the upper and lower 1/3's of the oven.
Preheat oven to 325°F.
Cover 2 large cookie sheets with parchment paper Mix flour, baking powder & salt in a bowl or bag and set aside.
Mix butter and sugars with with a mixer until blended and smooth, add egg, yolk & vanilla.
Mix until incorporated.
Add dry ingredients and mix until just combined.
Stir in chips and optional nuts.
Divide into 18 equal balls, a 2" cookie scoop works just about perfectly, about 60 gms each.
EVENLY space 9 on each cookie sheet.
Bake for 12-18 minutes, rotating front to back and top to bottom after 8 minutes.
Cool on sheets to maintain chewy texture.