For the cleanest look, dust the powdered sugar only on the top cookies before assembling. This keeps the jam visible through the cut-out window and prevents the sugar from dissolving into the filling.
Store assembled cookies in an airtight container at room temperature for up to 3 days, or refrigerate for up to 5 days. The flavors deepen slightly over time, making them just as delicious the next day. These cookies are perfect for gifting, holiday trays, or enjoying slowly with coffee or tea.
