Start by preheating your oven to 350°F (175°C). This ensures that your cookies bake evenly and achieve that perfect golden color.
In a large mixing bowl, whisk together the vegetable oil, dark brown sugar, granulated sugar, applesauce, and vanilla extract until smooth. If using cinnamon, now is the time to add it in.
In another bowl, combine the all-purpose flour, rolled oats, baking soda, and salt. Stir until well mixed.
Gradually add the dry ingredient mixture into the wet ingredients. Use a rubber spatula to gently mix until just combined. Be careful not to overmix, as this can result in dense cookies.
Fold in the dark chocolate chips, making sure they’re evenly distributed throughout the cookie dough.
Using a cookie scoop or two tablespoons, drop rounded balls of dough onto the prepared baking sheets, spacing them about 2 inches apart. Bake in the preheated oven for 10-12 minutes or until the edges are lightly golden.
Once baked, remove the cookies from the oven and let them cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely. Enjoy these Vegan Oatmeal Chocolate Chip Cookies warm or at room temperature!