These are a simple little treat with an indulgent cream cheese crust filled with jam. You can use whatever flavor you have on hand, I thought the raspberry would be pretty and it's one of my favorite flavors of jam. That and my husband won't use it for peanut butter and jelly sandwiches so we weren't out of it when I went to make these. Use jelly or preserves for these, it doesn't matter. I prefer preserves so that's what I used here.
Recipe adapted from Melissa D'Arabian via Food Network
1 cup unsalted butter, at room temperature
8 oz cream cheese, at room temperature
2 cups all purpose flour
1/4 tsp salt
Approximately 1/2 cup raspberry jam
1 egg white
Combine butter and cream cheese in a mixing bowl and beat until light and fluffy, about three minutes. Slowly add the flour and salt, beating on low speed until just combined. Lay out a large sheet of plastic wrap and turn the dough out onto the plastic. Form into a disk, wrap tightly and refrigerate at least one hour.
Preheat the oven to 375 degrees. Line a large baking sheet with parchment paper. Generously flour your work surface and a rolling pin. Roll out the dough to about 1/8" thick. Cut out rounds or shapes as desired. Add about a half a teaspoon of jam to one side of each cookie. Brush the edges lightly with water. Fold the dough over and press to seal. Crimp the edges with a fork. Re-roll scraps and continue with remaining dough.
Beat egg white with approximately one tablespoon of water, brush over cookies and sprinkle cookies with sanding sugar. Bake until golden, about 18 - 20 minutes. Transfer to a wire rack to cool completely and serve.