Preheat oven to 350F. Line a large baking sheet with parchment; set aside.

Sift together the flour, baking powder, baking soda, and salt. Stir in oats; set aside.

In a mixer fitted with a paddle attachment, cream butter and sugar until light in color and fluffy. Add the molasses and beat until combined. Add eggs, one at a time, beating well after each one. Scrape down the sides of the bowl as needed. Beat in milk and vanilla. Add in the dry ingredients and bet until just incorporated. Remove from stand mixer and fold in the chocolate chips and pecans.

Use a cookie scoop (or your hands) to put ping-pong ball-sized balls of dough on prepared baking sheet, leaving a couple inches between each one. Flatten slightly with your hands.

Bake for 10 – 12 minutes or until the edges are brown. Remove to a wire rack to cool.