So I used 3/4 cup brown sugar and 3/4 cup white sugar.  All the rest of the ingredients remained the same.  I used 1 cup of milk chocolate chips and 1 cup chopped 60% cacao Callebaut from a block that I had left over from another recipe.

I think this cookie may be my new favorite.  I love the texture and flavor.  Even with the change in the sugar ratio they were delicious.  I did find them a bit less moist than the cookie with more brown sugar, but not enough to make them less tasty.

Chewy Chocolate Chip Cookies

Ingredients

• 2 sticks unsalted butter
• 2 1/4 cups bread flour
• 1 teaspoon kosher salt
• 1 teaspoon baking soda
• 3/4 cup sugar
• 3/4 cups brown sugar
• 1 egg
• 1 egg yolk
• 2 tablespoons milk
• 1 1/2 teaspoons vanilla extract
• 1 cup milk chocolate chips
• 1 cup chopped dark chocolate

Directions

1. Heat oven to 375 degrees F.
2. Melt the butter in a heavy-bottom medium saucepan over low heat. Sift together the flour, salt, and baking soda and set aside.
3. Pour the melted butter in the mixer’s work bowl. Add the sugar and brown sugar. Cream the butter and sugars on medium speed. Add the egg, yolk, 2 tablespoons milk and vanilla extract and mix until well combined. Slowly incorporate the flour mixture until thoroughly combined. Stir in the chocolate and chips.
4. Chill the dough for at least an hour, then scoop onto parchment-lined baking sheets, 6 cookies per sheet. Bake for 10 minutes or until golden brown. Rotate the baking sheet halfway through for even browning. Cool completely and store in an airtight container.