Whisk brown rice flour, potato starch, cocoa powder, brown sugar, baking soda, and salt in a large bowl.
Add the peanut butter, vanilla, milk, and oil. Mix until incorporated well.
Let chill the mixture covered in the refrigerator for at least one hour.
Preheat the oven to 350°F (180°C). Line a baking sheet with parchment paper or a silicone mat.
With the help of a spoon portion out the dough into small balls and place them on the prepared baking sheet. Place the chocolate chips or chunks on the cookies.
Bake for 12 minutes, keep in mind that all ovens are different. Let cool before removing to a wire rack.
Notes
Cookies can be stored in an airtight container at room temperature for up to 3 days, or in the refrigerator for 5 days.
Keyword Easy chocolate cookies (Vegan + Gluten-free)