Butterscotch Oatmeal Cookies

Ingredients

• ¾ cup (170g) unsalted butter (at room temperature)
• ¾ cup (150g) light or dark brown sugar
• ½ cup (100g) granulated sugar
• 1 large egg (at room temperature)
• 2 teaspoons vanilla extract
• 1¼ cups (150g) all-purpose flour
• 1 Tablespoon (10g) cornstarch
• 1 teaspoon baking soda
• ½ teaspoon cinnamon
• ½ teaspoon salt
• 2 cups (160g) old-fashioned oats
• 1 cup (7-ounces or 200g) butterscotch chips