Mash the banana, then add the peanut butter, maple, oats, flax, baking powder, vanilla, and salt. Mix everything well.
Fold in the chocolate chips and chopped walnuts.
Scoop up the cookie dough with a cookie scoop. You will get about 7 cookies. Feel free to double the recipe if you want more.
Line a baking tray with parchment paper and drop the cookie dough onto the tray.
Gently flatten each cookie and add more chocolate chips on top, if you wish.
Bake the cookies for 10-12 minutes at 350F, until the edges start to get a little golden.
Top the cookies with some flaky salt and enjoy!
