Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.

Cream together the butter and sugar until light and fluffy.

Add the egg and vanilla extract. Beat until combined.

Stir in the orange zest.

Mix the flour and baking soda in a separate bowl, then add to the wet ingredients.

Scoop tablespoon-sized dough portions and place them on the baking sheet.

Bake for 8-10 minutes until lightly golden around the edges.

Allow to cool before serving.