6 ounces (12 tablespoons) unsalted butter, softened
1 cup light brown sugar
1/3 cup sugar
Grated zest from one orange
2 large eggs
1 teaspoon vanilla extract
2 1/4 cups old fashioned oats
1 1/4 cups flour
3/4 teaspoon baking soda
1/4 teaspoon kosher salt
1 cup milk chocolate chunks, or chips