Preheat the oven to 350°F. Line a baking sheet with parchment paper or a silicone mat and set aside.
In a medium bowl, beat together the butter and sugar until light and fluffy. Add in the peanut butter, eggs and vanilla and mix until fully combined.
In a separate bow, mix together the oats, baking powder, flour, and chia seeds. Slowly mix into the wet ingredients until fully incorporated.
Fold in the chocolate chips.
Form the cookie dough into balls, and place them 1 inch apart on the baking sheet.
Bake in the preheated oven for 12-14 minutes, or until the edges are golden. Let the cookies cool on the baking sheet for 5 minutes, then transfer to wire racks to cool completely.