Bakery Style Chewy Chocolate Chip Cookies

• 2 cups all-purpose flour (280 gms)
• 2 tablespoons all-purpose flour (20 gms)
• 1/2 teaspoon baking powder
• 1/2 teaspoon salt
• 12 tablespoons unsalted butter, melted and cooled until warm (170 gms)
• 1 cup packed brown sugar (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 of chopped walnuts (114 gms) (optional)

Directions

• Place oven racks in the upper and lower 1/3's of the oven. 
• Pre-heat 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