Melt-in-Your-Mouth Thumbprint Cookies

1. Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
2. Cream the butter and sugar together in a bowl until light and fluffy. Add vanilla extract.
3. Sift in the flour, cornstarch, and salt, then mix until a smooth dough forms.
4. Roll the dough into small balls (about 1 inch in diameter) and place them on the baking sheet.
5. Use a thumb or the back of a spoon to make small indentations in each cookie.
6. Bake for 10-12 minutes until the edges are lightly golden. Let them cool slightly.
7. Fill the cookies with jam, chocolate, caramel, or your favorite spread.
8. Decorate with crushed nuts, sprinkles, or a dusting of powdered sugar.
9. Let them set for a few minutes, then enjoy!

Tips:

✔️ For extra softness, let the dough rest in the fridge for 15 minutes before rolling.
✔️ Want a crispier version? Add an extra tablespoon of flour.
✔️ You can make different flavors by adding lemon zest, almond extract, or cinnamon to the dough.