1.

In a large bowl, beat the butter and sugar for 2-3 minutes, until pale and light.

2.

Beat in the egg and vanilla.

3.

Add the flour and salt and beat on low speed or stir by hand just until you have a soft dough.

4.

Divide the dough in half, shape each into a disc, wrap in plastic and let rest or refrigerate for at least an hour, or for up to a few days.

5.

When you’re ready to bake, preheat the oven to 325˚F.

6.

On a lightly floured surface, roll each piece of dough out to about 1/4-inch thick. Cut into 2 1/2—inch stars, hearts, rounds or other shapes with a cookie cutter or glass rim, and cut smaller windows out of half of the cookies with a smaller cutter.

7.

Transfer to a parchment-lined sheet and bake for 10 minutes, or until pale golden around the edges and set. Transfer to a wire rack to cool.

8.

Spread the solid cookies with jelly or jam.

9.

Place the cookies with windows on a baking sheet and sprinkle with icing sugar, then place them on top of the cookies spread with jam.