Gourmet has a really interesting feature on their website right now, highlighting their favorite cookies from the last 68 years. I love cookies, and I love making cookies. They're so easy and not terribly fussy and can usually be thrown together in a few minutes. Sometimes they need to chill for an hour or two (while you catch up on dishes, eat some food, watch some tv, walk the dog, or read some favorite food blogs) and sometimes not. Some of the cookies featured were not terribly interesting to me, but some called out. This one, in particular, I wanted to eat. I don't think I have a great thumbprint jam cookie recipe yet. This is it. Quick to throw together, short list in ingredients, nothing weird that you might not have on hand. The only problem is that it uses egg yolks, not whole eggs. This is a problem if you don't feel like whipping up some pavlovas, meringues, macarons, or any of the other fabulous desserts that need whites only.
However! I imagine (and will try it next time) that this can be made with 1 egg, instead of yolks. I will keep you posted.
jam of your choice (I used homemade peach marmalade)
Mix the rice flour, xanthan gum, sugar, and salt. Work in the butter until mixture is crumbly. Mix in the egg yolks, and if dough is too crumbly add a tiny bit of milk at a time, just until the dough holds together. Wrap tightly in plastic wrap and stick in the fridge for a few hours.
Preheat the oven to 350. Roll the cold dough into balls, press your finger into the middle to make an indent, and fill with jam. Bake 10-12 minutes, cool on cookie sheet. These can hang out, wrapped in plastic, for at least a few days on the counter.