Orange-flavored shortbread cookies with a delicate citrus aroma are a Mexican bakery staple. This family-friendly treat is a buttery, fragrant, crumbly confection for any occasion.
Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a mixing bowl, beat the softened butter and powdered sugar together until pale and creamy, about 2 minutes on medium speed.
Add the orange zest, egg yolk, and vanilla extract, then mix until just combined.
Gradually add the flour and salt, mixing on low speed. Stop as soon as a soft dough forms to avoid overworking.
Roll dough into small balls (about 1-inch diameter) and place 2 inches apart on the baking sheet. Flatten each slightly to form thick discs.
Bake for 14–16 minutes until the edges just start turning golden; avoid overbaking for the best crumbly texture.
Cool cookies on the baking sheet for 5 minutes, then transfer carefully to a wire rack to cool completely before serving.