Preheat convection oven to 175°C (350°F) and line baking sheets with parchment paper.
In a stand mixer equipped with a paddle attachment, cream butter, brown sugar, and granulated sugar on medium speed for 3 minutes until aerated.
Add egg, vanilla extract, orange zest, and orange juice, mixing until fully emulsified.
In a separate vessel, sift together flour, baking soda, cinnamon, and salt.
Incorporate dry ingredients into the wet mixture on low speed until just combined.
Fold in rolled oats and chocolate chips manually to ensure even distribution without overworking the gluten.
Portion dough into 35g spheres and place on baking sheets with 5cm spacing.
Bake for 10 to 12 minutes or until the edges reach a golden-brown state while the center remains soft.
Allow to set on the baking sheet for 300 seconds before transferring to a wire cooling rack.