Crumbly shortbread cookies that melt in your mouth are a classic Mexican confection. This family-favorite treat is a delicate, buttery cookie perfect for holidays and celebrations.
Preheat oven to 350°F (175°C). Line a large baking sheet with parchment paper for best results.
In a large bowl, cream the unsalted butter and 0.5 cup powdered sugar with a mixer on medium until light and fluffy (about 2–3 minutes).
Add vanilla extract, mixing until incorporated, then stir in salt, ground cinnamon, and finely chopped pecans.
Gradually add all-purpose flour, mixing on low until just combined to create a soft, delicate dough. Take care not to overmix.
Scoop tablespoon-sized portions of dough and shape gently into balls. Place 1 inch apart on prepared baking sheet.
Bake for 15–18 minutes, until edges are just turning golden—do not overbake to maintain tenderness.
Cool cookies on the sheet for 5 minutes to prevent crumbling, then gently transfer to a rack. While still warm, roll in additional powdered sugar to coat.
Let cookies cool completely before serving for the signature crumbly, melt-in-your-mouth texture.