For the Cookies:

2 ½ cups all-purpose flour

½ teaspoon baking powder

¼ teaspoon salt

1 cup unsalted butter, softened

1 cup granulated sugar

1 large egg

1 teaspoon vanilla extract

For the Marshmallow Fluff Filling:

1 cup marshmallow fluff

½ cup unsalted butter, softened

1 cup powdered sugar

1 teaspoon vanilla extract

Food coloring (optional)

For Decoration:

Colored icing or edible markers for writing messages

Prepare the Cookie Dough: In a medium bowl, whisk together the flour, baking powder, and salt.
Cream Butter and Sugar: In a large mixing bowl, beat the softened butter and sugar until light and fluffy. Add the egg and vanilla extract, mixing until fully combined.
Combine Wet and Dry Ingredients: Gradually add the dry ingredients to the wet mixture and mix until a dough forms.
Chill the Dough: Divide the dough into two portions, wrap in plastic wrap, and chill in the refrigerator for at least 1 hour.
Preheat the Oven: Preheat the oven to 350°F (175°C) and line baking sheets with parchment paper.
Roll Out the Dough: Roll out the chilled dough to about ¼-inch thickness. Use heart-shaped cookie cutters to cut out shapes.
Bake the Cookies: Transfer the cut-out dough to baking sheets and bake for 10-12 minutes or until the edges are golden. Cool completely.
Prepare the Marshmallow Fluff Filling: Beat together marshmallow fluff, softened butter, powdered sugar, and vanilla until smooth. Add food coloring if desired.
Assemble the Cookies: Spread marshmallow filling on the flat side of half the cookies. Top with remaining cookies to form sandwich cookies.
Decorate: Use colored icing or edible markers to add fun messages like “Be Mine” or “XOXO.”

For added flavor, try adding almond extract to the cookie dough.

For a different texture, replace marshmallow fluff with buttercream frosting.

Customize the filling by adding food coloring for a personalized touch.

Make these gluten-free by using a gluten-free flour blend.