Lemon Vanilla Cornstarch Cookies with Dulce de Leche

Introduction

These cookies use more cornstarch than flour, so they bake up tender and crumbly instead of chewy. The vanilla, grated lemon rind, and dulce de leche filling give you a cookie that works for a dessert tray, coffee break, or a batch you can make ahead and assemble later.

Recipe Details

• Prep Time: 15 minutes
• Cook Time: 30 minutes
• Total Time: 45 minutes
• Servings: 18 sandwich cookies

Ingredients

• ½ cup (120 ml) butter
• 1 cup (240 ml) white granulated sugar
• 1 egg
• 2 egg yolks
• 1 tsp vanilla
• 2 tsp lemon rind, grated
• 1½ cup (360 ml) cornstarch
• ½ cup (120 ml) flour
• 1 tsp baking powder
• ¼ tsp salt
• Dulce de leche

Instructions

1. Cream butter; add sugar and beat until fluffy.
2. Add egg and egg yolks one at a time, beating well. Beat in vanilla and lemon rind.
3. Sift together cornstarch, flour, baking powder, and salt. Add to batter and mix well.
4. Drop batter by small spoonfuls onto well-buttered baking sheet.
5. Bake at 350°F for 15 minutes. Remove immediately and cool.
6. Sandwich the cookies together with dulce de leche.

Variations

• Swap the 2 tsp lemon rind, grated for orange rind if you want a sweeter, less sharp citrus note.
• Replace the Dulce de leche with a thick fruit jam for a lighter, fruit-forward filling; the finished cookies will be less rich and a little less sticky.
• Use a gluten-free all-purpose flour blend in place of the ½ cup (120 ml) flour if you need a gluten-free version; the cookies stay tender because cornstarch still drives the texture.
• Chill the dropped batter on the baking sheet for 10 minutes before baking if you want slightly thicker cookies with less spread.

Tips for Success

• Cream the butter and white granulated sugar until the mixture looks lighter and visibly fluffy; that step gives the cookies a softer, less dense crumb.
• Add the egg and egg yolks one at a time as written so the batter stays smooth and emulsified.
• Sift the cornstarch, flour, baking powder, and salt well to prevent dry pockets in a dough that is already delicate.
• Bake just until set at 15 minutes and remove immediately; these cookies should stay pale rather than deeply browned.
• Let the cookies cool fully before adding Dulce de leche so the filling does not melt and slide.

Storage and Reheating

Store the sandwiched cookies in an airtight container with parchment between layers. Keep them at room temperature for up to 2 days or in the fridge for up to 5 days.

For longer storage, freeze the baked cookies in a freezer-safe container for up to 2 months. Unfilled cookies freeze better than assembled ones, since the dulce de leche can soften as it thaws.

These do not need reheating. If chilled or frozen, let them sit at room temperature for 15 to 20 minutes before serving; avoid the microwave, which can melt the filling and make the cookies break apart.

FAQ

Can you make the dough ahead of time?

Yes. Refrigerate the mixed dough for up to 24 hours, then let it soften slightly if it becomes too firm to spoon.

Why are the cookies fragile when you sandwich them?

The high cornstarch content makes them delicate by design. Cool them completely and press the top cookie on gently after adding a small amount of dulce de leche.

Can you replace the cornstarch with more flour?

No. The cornstarch gives these cookies their short, crumbly texture, and extra flour will make them denser and more like standard sugar cookies.

Can you make these gluten-free?

Yes, replace the ½ cup (120 ml) flour with a gluten-free all-purpose blend. Check that your baking powder and dulce de leche are also gluten-free if that matters for your kitchen.