Preheat the oven to 175C/350F.
Line 2 baking sheets with parchment paper.
In a mixing bowl, add flour, baking soda, baking powder, and salt.
Sieve if dry ingredients are clumpy.
Then stir in oats and chocolate chips.
In your mixer, beat butter and 2 sugars until light and fluffy.
Add egg and mix until combined.
Then add vanilla extract, and mix.
Add dry ingredients in 3-4 additions.
Use a spatula to make sure it’s well combined.
Shape cookies into size of ping pong balls.
Placed on lined cookie sheet about 2 inches apart.
Press cookies down to about ½ inch thickness.
Bake for 10 minutes or until edges of the cookies are golden brown, and still soft in the middle.
Allow cookies to cool for 5 minutes before transferring to cool completely on wire rack.