350 degree oven. Line large cookie sheet with parchment paper and set aside.
Whisk ground oats, flour, baking powder, baking soda and salt in bowl. In another bowl, beat butter and sugars at medium speed until light and fluffy, about three minutes. Add eggs and vanilla; continue beating until combined; about 40 seconds. Add dry ingredients and beat at low speed until just combined, about 20 seconds. Add chocolate chips, coconut and nuts; stir to combine. Do not over mix.