Preheat oven to 400°F. Line a baking sheet with parchment paper. Set aside.
In a large mixing bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, nutmeg, and rolled oats.
To the bowl of a stand mixer fitted with the paddle attachment, add the butter and brown sugar. Beat on low speed until smooth.
Add the eggs, vanilla extract, and molasses. Mix until all ingredients are fully incorporated, stopping to scrape down the sides of the bowl as needed.
With the mixer still on low speed, slowly add the dry ingredients until combined.
Fold in 1 ½ cups of the chocolate chips, reserving the rest for topping.
Cover the dough and refrigerate for 30 minutes.
Using a 2-tablespoon scoop, drop the dough onto the prepared baking sheet. Roll each portion into a ball, then gently press to slightly flatten the cookies.
Press the remaining ½ cup chocolate chips into the tops of the cookies.
Bake for 7 to 8 minutes. The cookies may look slightly doughy, and that is okay.
Let the cookies rest on the baking sheet for a couple of minutes before transferring them to a wire rack to cool completely.