Mix the dry ingredients:In your first bowl, add the oats, brown sugar, baking powder, and 2 tablespoons of flour. Stir with a spoon or fork until well combined.
Whisk the wet ingredients:In your second bowl, whisk together the melted butter, egg, vanilla, orange juice, and zest until smooth.
Combine wet and dry:Pour the wet mixture into the dry ingredients and stir to combine. If the batter seems too wet, add an extra tablespoon of flour. (This might vary depending on your egg size or tablespoon measurement—NZ tablespoons are 15ml, while some countries use 20ml.)
Add choc chips:Stir in the chocolate chips. Feel free to use a little more if you like—it’s hard to go wrong here! I found 20g was just right for my kids.
Shape and bake:Scoop generous tablespoons of dough onto your prepared tray. This batch makes about 12 cookies. Gently shape each with the back of your spoon into rough rounds. They don’t need to be perfect—just a bit flattish, as they’ll spread slightly during baking.
Bake at 180°C (360°F) for 12–15 minutes, until the edges are lightly golden.