Delicate sandwich cookies joined with jam are a sweet Mexican bakery classic. This family-friendly treat is a light, charming, traditional confection perfect for tea time.
Preheat the oven to 350°F (175°C) and line two baking sheets with parchment paper for even baking.
In a large bowl, cream together unsalted butter and granulated sugar until light and fluffy; beat in eggs one at a time, then stir in vanilla extract.
Sift together all-purpose flour, baking powder, and salt; gradually mix dry ingredients into the butter mixture, alternating with milk, to form a soft dough.
Scoop dough by rounded tablespoons, roll into balls, and place them 2 inches apart on prepared sheets; flatten tops gently with your fingers.
Bake for 12–14 minutes, rotating sheets halfway through baking, until the bottoms are lightly golden and the tops are set but not browned.
Allow cookies to cool completely on a wire rack; then spread a generous 1/2 tablespoon of strawberry jam onto the flat side of one cookie and sandwich with another.
Dust the tops of the assembled cookies with powdered sugar before serving for a classic, charming finish.