1. Preheat the Oven

• Preheat your oven to 350°F (175°C).
• Line a baking sheet with parchment paper or lightly grease it with oil to prevent sticking.

2. Cream the Wet Ingredients

• In a mixing bowl, combine the softened butter, oil, and powdered sugar.
  • Beat the mixture with an electric mixer or whisk until light and fluffy.
• Add the egg and a pinch of vanilla. Mix well until fully incorporated.

3. Combine the Dry Ingredients

• In another bowl, sift together the cornstarch, baking powder, and flour.
• Gradually add the dry ingredients to the wet ingredients, stirring gently.
• Mix just until a soft dough forms. Avoid overmixing to maintain the tender texture of the cookies.

4. Shape the Cookies

• Scoop out small portions of the dough (about a tablespoon) and roll them into smooth balls.
• If you want to add fillings, slightly flatten the balls and create a small indentation in the center.

5. Add Fillings and Toppings

• For Chocolate Lovers: Press a piece of chocolate into the center of each cookie.
• For Jam Fans: Add a small dollop of jam or honey to the indentations.
• For Coconut Enthusiasts: Sprinkle the cookies with coconut powder before baking.

6. Bake the Cookies

• Place the cookie dough balls on the prepared baking sheet, leaving about 2 inches of space between them.
• Bake in the preheated oven for 10-12 minutes, or until the edges are lightly golden brown. The centers should remain soft and chewy.

7. Cool and Serve

• Remove the cookies from the oven and let them cool on the baking sheet for about 5 minutes.
• Transfer them to a wire rack to cool completely.
• Once cooled, serve the cookies on a plate and enjoy their buttery, melt-in-your-mouth goodness.