Preheat your oven to 350°F (175°C). This ensures that your cookies bake evenly and come out perfectly golden.
Line your baking sheet with parchment paper. This prevents sticking and makes cleanup a breeze.
In a large mixing bowl, combine the old-fashioned oats, all-purpose flour, baking powder, baking soda, ground cinnamon, ground cloves (if using), and salt. Whisk until well blended.
In another bowl, whisk together the melted and cooled unsalted butter, pure vanilla extract, packed light brown sugar, granulated sugar, and the large egg until smooth and creamy.
Gradually add the dry mixture to the wet mixture, stirring until just combined. Do not overmix; a few flour streaks are okay.
Gently fold in the chocolate chips of your choice until they are evenly distributed throughout the dough.
Using a cookie scoop or tablespoon, drop rounded balls of dough onto the prepared baking sheet, spacing them about 2 inches apart. Bake in the preheated oven for 10-12 minutes, or until the edges are lightly golden.
Remove the cookies from the oven and allow them to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely. Enjoy your delicious Oatmeal Chocolate Chip Cookies warm or at room temperature!