Sourdough Oatmeal Cookies

Name: Sourdough Oatmeal Cookies
Prep time: 15 min
Cook time: 8 min
Total time: 23 min
Cuisine: American
Ingredients: 7 ½ oz all purpose flour (1 ½ cups, see note); 1 teaspoon baking soda; 1 teaspoon cinnamon; ½ teaspoon salt; 8 oz unsalted butter (room temperature); 8 oz light brown sugar (1 cup, packed); 4 oz granulated sugar (½ cup); 2 large eggs; 2 teaspoons vanilla extract; 8 oz sourdough discard (1 cup); 10 oz old-fashioned rolled oats (3 cups); 8 oz confectioner's sugar (2 cups); 2 oz fresh lemon juice (¼ cup)