1-Preheat: preheating your oven to 350 degrees F and lining two baking sheets with parchment paper or mats.

2-Brown Butter: Cut the 1 cup unsalted butter into tablespoons and melt it over medium heat, stirring occasionally until it turns amber with a nutty aroma; this takes about 20 minutes, then let it cool.

3-Prepare Dry Ingredients: In a bowl, whisk together the 1 1/2 cups all-purpose flour, 1 teaspoon baking soda, 1 teaspoon salt, and 1 teaspoon ground cinnamon. This sets the foundation for the cookie’s texture and flavor.

4-Combine Wet Ingredients and Sugar: In a mixer, combine the cooled browned butter with the 1 cup packed brown sugar and 1/2 cup granulated sugar, beating until creamy. Add the 2 large eggs and 1 1/2 teaspoons vanilla extract, mixing well.

5-Mix Dough: Gradually add the dry ingredients on low speed until just combined, then stir in the 3 cups old fashioned rolled oats and 1 3/4 cups butterscotch chips.

6-Form and Bake Cookies: Form the dough into balls using 2 tablespoons per ball, place them 2 inches apart on the baking sheets, and sprinkle with sea salt if you like. Bake for 8-10 minutes until the edges are slightly brown. Let the cookies cool on the sheets for 2-3 minutes, then move to a wire rack.