Step 1: Preheat the oven to 350°F (175°C).
Step 2: Cream the butter and sugars together until light and fluffy.
Step 3: Add the egg and vanilla extract, beating until well incorporated.
Step 4: In a separate bowl, whisk together the rolled oats, flour, salt, baking powder, and baking soda.
Step 5: Combine the wet and dry ingredients until just mixed.
Step 6: Fold in the milk chocolate chips.
Step 7: Scoop rounded balls of dough onto a baking sheet lined with parchment paper.
Step 8: Bake for 10-12 minutes until edges are lightly golden.
Step 9: Cool on the baking sheet for a few minutes before transferring to a wire rack.
