Chewy Chocolate Chip Cookies

Name: Chewy Chocolate Chip Cookies
Ingredients: 1 2/3 cups (227 grams) all-purpose flour; 1 cup (80 grams) rolled oats (not instant); 1/2 teaspoon baking soda; 3/4 cup to 1 cup (150 to 200 grams) sugar (see headnote); 1/2 cup to 3⁄4 cup (100 to 150 grams) packed light brown sugar (see headnote); 1 teaspoon fleur de sel or 3⁄4 teaspoon fine sea salt; 1/2 teaspoon ground cinnamon (optional); 2 large eggs, at room temperature; 1 1/2 teaspoons pure vanilla extract; 14 tablespoons (1 3/4 sticks; 7 ounces; 198 grams) unsalted butter, melted and still warm; 3/4 pound (340 grams) semisweet or bittersweet chocolate, chopped into irregular bits