2-1/2 sticks (10 ounces) unsalted butter, at room temperature
1 cup sugar
Pinch of salt
4 large egg yolks, at room temperature
1 teaspoon finely grated lemon zest
1 teaspoon gf vanilla
3 cups Gluten-Free Pantry French Bread Flour Mix
Gf apricot or seedless raspberry jam
Royal Icing