Step 1: Preheat your oven to 350°F (175°C).
Step 2: In a large mixing bowl, combine the vegetable oil, dark brown sugar, granulated sugar, applesauce, and vanilla extract. Whisk until smooth.
Step 3: Add the cinnamon (if using), all-purpose flour, rolled oats, baking soda, and salt. Stir until just incorporated.
Step 4: Fold in the dark chocolate chips until evenly distributed.
Step 5: Drop the dough onto a prepared baking sheet, leaving space between cookies.
Step 6: Bake for 10-12 minutes, until the edges are lightly golden.
Step 7: Cool on the baking sheet for a few minutes before transferring to a wire rack.
